Difference between revisions of "Installing Lazarus on Windows"

From Lazarus wiki
Jump to navigationJump to search
(→‎Installing Lazarus from sources on Windows: Remove reference to defunct git-svn (Needs Updating for SVN -> Git transition)
 
(12 intermediate revisions by 2 users not shown)
Line 13: Line 13:
 
Upgrading can be as simple as downloading the new installer and running it. You will be taken through a typical Windows installation wizard to install the FPC compiler and FPC source within the same directory structure as Lazarus IDE, and Lazarus should launch and operate without significant problems, provided you have '''uninstalled''' any previous version of Lazarus and/or FPC which was not installed with a recent version fo the Windows installer (older installations can often be found in the C:\pp directory).
 
Upgrading can be as simple as downloading the new installer and running it. You will be taken through a typical Windows installation wizard to install the FPC compiler and FPC source within the same directory structure as Lazarus IDE, and Lazarus should launch and operate without significant problems, provided you have '''uninstalled''' any previous version of Lazarus and/or FPC which was not installed with a recent version fo the Windows installer (older installations can often be found in the C:\pp directory).
  
You can also use a Lazarus Snapshot. For download locations see [[Lazarus Snapshots Downloads]].
+
<!-- You can also use a Lazarus Snapshot. For download locations see [[Lazarus Snapshots Downloads]]. -->
  
Tip: It's perhaps a good idea to reboot your Windows system after you have installed Lazarus and before you try to install additional Lazarus components such as zeoslib for example.
+
{{Tip|It's perhaps a good idea to reboot your Windows system after you have installed Lazarus and before you try to install additional Lazarus components such as zeoslib for example.}}
  
 
== Installing Lazarus on a Portable USB device ==
 
== Installing Lazarus on a Portable USB device ==
Line 27: Line 27:
 
== Installing Lazarus from sources on Windows ==
 
== Installing Lazarus from sources on Windows ==
  
The following instructions are for SubVersion, but there is also a Git mirror repository of Free Pascal Compiler and Lazarus. See [[git mirrors|Git mirror]] for details. You can also use git directly with SubVersion server using git-svn link. See [[Lazarus git-svn|Lazarus git-svn]] for details. If you are not planning to follow trunk development, just want a one-off, that git mirror will allow you to download a zip file of the Lazarus Trunk Source, about 40Meg.
+
The following instructions are for both SubVersioN and Git repository of the Lazarus IDE.  If you are not planning to follow the development source, just want a one-off, you can download a zip file of the Lazarus development source.
  
It is assumed that the following installation will go into a folder <tt>c:\Lazarus-trunk</tt>. Of course any other name can be used for it provided that it does not contain spaces or non-ASCII characters, and that the folder is fully writable for the user. This excludes from installing into <tt>c:\Program files</tt>.  
+
It is assumed that the following installations will go into folders appropriately named <tt>c:\Lazarus-fixes22</tt> or <tt>c:\Lazarus-dev</tt>. Of course any other folder names can be used provided that they do not contain spaces or non-ASCII characters, and that the folders are fully writeable by the user. Do NOT install into <tt>c:\Program files</tt> which is not fully writeable by a user.  
  
 
=== Getting the Lazarus sources by using TortoiseSVN ===
 
=== Getting the Lazarus sources by using TortoiseSVN ===
 +
 
The easiest way to work with svn is by using the TortoiseSVN application (https://tortoisesvn.net/index.de.html). Install this application if you do not have it already. It adds short-cuts to the Explorer context menu from which you can work with svn easily.
 
The easiest way to work with svn is by using the TortoiseSVN application (https://tortoisesvn.net/index.de.html). Install this application if you do not have it already. It adds short-cuts to the Explorer context menu from which you can work with svn easily.
  
To download the Lazarus trunk sources create folder <tt>c:\Lazarus-trunk</tt> and right-click on it in the Explorer. In the context menu open the command ''SVN Checkout...''. Enter the ''URL of the SVN repository'' in the corresponding box. This is  
+
To download the Lazarus fixes 2.2 sources create the folder <tt>c:\Lazarus-fixes22</tt> and right-click on it in Explorer. In the context menu open the command ''SVN Checkout...''. Enter the ''URL of the SVN repository'' in the corresponding box. This is:
* <tt>https://svn.freepascal.org/svn/lazarus/trunk/</tt> for trunk or
+
* <tt>https://svn.freepascal.org/svn/lazarus/branches/fixes_2_0</tt> for the fixes version (adjust the version number in the <tt>fixes_2_0</tt> folder accordingly).  
+
* <nowiki>https://github.com/fpc/Lazarus/branches/fixes_2_2</nowiki> for the fixes version (adjust the version number in the <tt>fixes22</tt> folder name for the current version).
Make sure that the ''Checkout directory'' box contains the directory in which you want to have the new Lazarus version (<tt>c:\Lazarus-trunk</tt> in our example). After pressing OK the source files are downloaded which will take some time.
+
 +
Make sure that the ''Checkout directory'' box contains the directory in which you want to have the new Lazarus version (<tt>c:\Lazarus-fixes22</tt> in our example). After pressing OK the source files are downloaded which will take some time.
 +
 
 +
Note: svn checkout of the development version (aka trunk in svn or or main in git) is problematical due to an svn bug. See below using command line svn.
  
 
=== Getting the Lazarus sources from the command line ===
 
=== Getting the Lazarus sources from the command line ===
Alternatively to TortoiseSVN you can also download the sources from the command line if you have the command line version of SVN on your system (https://subversion.apache.org/packages.html#windows).
+
 
 +
Alternatively you can also download the sources from the command line if you have the command line version of SVN (https://subversion.apache.org/packages.html#windows) or GIT (https://gitforwindows.org/) on your system.
 +
 
 +
==== Downloading Lazarus "fixes" version source ====
 +
 
 +
[[Lazarus_2.2_fixes_branch|Details of the fixes]] included in the Lazarus 2.2 fixes version. Here are the steps to follow to download the fixes source:
 +
 
 
* Open a command prompt window
 
* Open a command prompt window
 +
 
* Create a folder for the new Lazarus:  
 
* Create a folder for the new Lazarus:  
<tt>md c:\Lazarus-trunk</tt>
+
 
 +
  md c:\Lazarus-fixes22
 +
 
 
* Change into this folder:  
 
* Change into this folder:  
  <tt>cd c:\Lazarus-trunk</tt>
+
   
* Execute the <tt>svn</tt> command with the <tt>checkout</tt> option (or in short: <tt>co</tt>) and the repository URL as parameter. The last parameter is the destination directory which can be specified explicitely or by simply typing "<tt>.</tt>" (because you made a <tt>cd</tt> to this directory in the preceding step):  
+
  cd c:\Lazarus-fixes22
<tt>svn checkout https://svn.freepascal.org/svn/lazarus/trunk/ c:\Lazarus-trunk</tt>
+
 
* If you want the sources of the fixes branch instead of trunk replace the <tt>trunk</tt> in the URL by <tt>fixes_n_m</tt> where <tt>n</tt> and <tt>m</tt> refer to the version number of the release version (e.g. <tt>fixes_2_0</tt> for the fixes of Lazarus v2.0.x"
+
Using git:
 +
 
 +
  <nowiki>git clone -b fixes_2_2 https://gitlab.com/freepascal.org/lazarus/lazarus.git .</nowiki>
 +
 
 +
Using svn:
 +
 
 +
  <nowiki>svn checkout https://github.com/fpc/Lazarus/branches/fixes_2_2 .</nowiki>
 +
 
 +
* The download will take some time. Be patient.
 +
 
 +
==== Downloading Lazarus development version source ====
 +
 
 +
Here are the steps to follow to download the development  (was known as "trunk" in SVN; now known as "main" in GIT) version source of the Lazarus IDE using svn or git:
 +
 
 +
* Open a command prompt window
 +
 
 +
* Create a folder for the new Lazarus:
 +
 
 +
  md c:\Lazarus-dev
 +
 
 +
* Change into this folder:
 +
 +
  cd c:\Lazarus-dev
 +
 
 +
Using git:
 +
 
 +
  <nowiki>git clone -b main https://gitlab.com/freepascal.org/lazarus/lazarus.git .</nowiki>
 +
 
 +
Using svn (due to an svn bug, this is a two step process):
 +
 
 +
  <nowiki>svn checkout --depth files https://github.com/fpc/Lazarus/branches .</nowiki>
 +
  svn update --set-depth infinity main
 +
 
 
* The download will take some time. Be patient.
 
* The download will take some time. Be patient.
  
 
=== Getting the Lazarus sources from a snapshot ===
 
=== Getting the Lazarus sources from a snapshot ===
Note: you probably don't want to do this. If you do not want to use svn you can also download the Lazarus sources from one of the [[Lazarus Snapshots Downloads|snapshot servers]]. But you should be aware that the snapshots are not built regularly and may be out of date.
 
  
You can also search GitHub for one of the unofficial Lazarus mirrors (check the mirror is still updating, by looking at the latest change date). GitHub offers to download any commit you choose as zip file. (Or by using git clone)
+
A snapshot of the Lazarus development version source is available from the official GitLab repository. You can download it through the Gitlab web interface at https://gitlab.com/freepascal.org/lazarus/lazarus. Alternatively, you can fetch it from https://gitlab.com/freepascal.org/lazarus/lazarus/-/archive/main/lazarus-main.zip.
  
Unzip the downloaded archive to the folder in which you want Lazarus to be installed, e.g. <tt>c:\lazarus-trunk</tt>.
+
Other, previously available snapshot 'servers', are mentioned here [[Lazarus Snapshots Downloads|snapshot servers]]. Not recommended.
 +
 
 +
Unzip the downloaded archive to the folder in which you want Lazarus to be installed, eg <tt>c:\lazarus-dev</tt>.
  
 
=== Building Lazarus ===
 
=== Building Lazarus ===
 +
 
Prerequisite for building Lazarus is that a recent FPC installation must be available. "Recent version" means:  
 
Prerequisite for building Lazarus is that a recent FPC installation must be available. "Recent version" means:  
* FPC trunk or fixes
+
 
* the current FPC release or
+
* the current FPC release
* the previous release version.  
+
* the previous release version;
If you already have a Lazarus release installation on your disk - here you can find the FPC in the equally named folder of the installation directory. Make sure that the FPC version number is adequate. If not, install a newer Lazarus release (which is always recommended). Or, of course, you can also install an FPC separately. You are also strongly recommended to install the FPC Source as well, not absolutely essential but very handy.
+
* the FPC fixes version; or
 +
* the FPC development version.
 +
 
 +
If you already have a Lazarus release installation on your disk - here you can find the FPC in the equally named folder of the installation directory. Make sure that the FPC version number is adequate. If not, install a newer Lazarus release (which is always recommended). Or, of course, you can also install FPC separately. You are also strongly recommended to install the FPC source as well, not absolutely essential but very handy.
  
 
You should also be aware that the bitness of the FPC determines the bitness of the Lazarus IDE and the bitness of the applications that you will create. So, when your fpc.exe resides in a folder <tt>i386_win32</tt> the IDE (and your applications) will be 32-bit. When the folder is <tt>x86_64-win64</tt> the IDE (and your applications) will be 64-bit.
 
You should also be aware that the bitness of the FPC determines the bitness of the Lazarus IDE and the bitness of the applications that you will create. So, when your fpc.exe resides in a folder <tt>i386_win32</tt> the IDE (and your applications) will be 32-bit. When the folder is <tt>x86_64-win64</tt> the IDE (and your applications) will be 64-bit.
Line 78: Line 128:
 
* Executing this batch file will build a Lazarus containing all the basic packages, like in a release version. (Of course you must install any other third-party packages by yourself later.)
 
* Executing this batch file will build a Lazarus containing all the basic packages, like in a release version. (Of course you must install any other third-party packages by yourself later.)
 
* if using Powershell, try these commands (this time assuming your FPC is in c:\FPC\3.2.2 - typical of a recent install) -
 
* if using Powershell, try these commands (this time assuming your FPC is in c:\FPC\3.2.2 - typical of a recent install) -
<syntaxhighlight>$env:PATH="c:\FPC\3.2.2\bin\x86_64-win64"
+
<syntaxhighlight lang=dos>$env:PATH="c:\FPC\3.2.2\bin\i386-win32"
 
make bigide
 
make bigide
 
</syntaxhighlight>
 
</syntaxhighlight>
* Since Lazarus trunk is not "stable" it may happen that the "bigide" version cannot be build due to an error in one of the standard packages. In this case it may be helpful to know that the basic IDE (with LCL only) can be build by using the <tt>make</tt> command without the <tt>bigide</tt> parameter:
+
* Since the Lazarus development version (trunk in svn, main in git) is not "stable" it may happen that the "bigide" version cannot be build due to an error in one of the standard packages. In this case it may be helpful to know that the basic IDE (with LCL only) can be built by using the <tt>make</tt> command without the <tt>bigide</tt> parameter:
  
 
<syntaxhighlight lang="dos">
 
<syntaxhighlight lang="dos">
Line 90: Line 140:
  
 
* Because the Lazarus IDE by default links to a dll-call "CreateToolhelp32Snapshot", which does not exist on the Win9x platform, the IDE will not run on Win9x out of the box. In order to make it run you have to rebuild the IDE with <tt>make -dWIN9XPLATFORM bigide</tt>.
 
* Because the Lazarus IDE by default links to a dll-call "CreateToolhelp32Snapshot", which does not exist on the Win9x platform, the IDE will not run on Win9x out of the box. In order to make it run you have to rebuild the IDE with <tt>make -dWIN9XPLATFORM bigide</tt>.
* Compilation will take some time again. At the end, the new IDE is ready, but you should not start it yet -- read the next chapter.
+
* Compilation will take some time again. At the end, the new IDE is ready, but you should not start it yet -- read the next section first.
  
 
=== Preparation for the first start ===
 
=== Preparation for the first start ===
Before you start the new IDE you should make sure that it does not interfere with your current other Lazarus installation(s). For this purpose you must have a separate directory for the Lazarus configuration files, maybe <tt>c:\LazConfigs\trunk</tt>. Lazarus writes is configuration settings to this folder if you open the <tt>lazarus.exe</tt> with the argument <tt>--primary-config-path=c:\LazConfigs\trunk</tt>, or shorter, <tt>--pcp=c:\LazConfigs\trunk</tt>. When this parameter is missing the configuration files are read from and written to the default folder in <tt>c:\users\<your_name>\appdata\lazarus</tt> which will very probably change settings of the other installation.
 
  
Since it is easy to forget this commandline parameter it is highly recommended to add a file <tt>lazarus.cfg</tt> to the lazarus installation folder (the folder containing <tt>lazarus.exe</tt>) in which the pcp parameter is listed. This is also how the Lazarus release versions handle secondary installations.
+
Before you start the new IDE you should make sure that it does not interfere with your current other Lazarus installation(s). For this purpose you must have a separate directory for the Lazarus configuration files, maybe <tt>c:\LazConfigs\trunk</tt>. Lazarus writes is configuration settings to this folder if you open the <tt>lazarus.exe</tt> with the argument <tt>--primary-config-path=c:\LazConfigs\dev</tt>, or shorter, <tt>--pcp=c:\LazConfigs\dev</tt>. When this parameter is missing the configuration files are read from and written to the default folder in <tt>c:\users\<your_name>\appdata\lazarus</tt> which will very probably change settings of the other installation.
  
<syntaxhighlight lang="dos">echo "--pcp=c:\LazConfigs\trunk" > lazarus.cfg [enter]</syntaxhighlight>
+
Since it is easy to forget this command line parameter it is highly recommended to add a file <tt>lazarus.cfg</tt> to the lazarus installation folder (the folder containing <tt>lazarus.exe</tt>) in which the pcp parameter is listed. This is also how the Lazarus release versions handle secondary installations.
  
Starting lazarus in the directory containing that <tt>lazarus.cfg</tt> file will ensure Lazarus keeps its config files in the nominated directory.
+
<syntaxhighlight lang="dos" inline>echo "--pcp=c:\LazConfigs\trunk" > lazarus.cfg </syntaxhighlight>{{keypress|enter}}
 +
 
 +
Starting Lazarus in the directory containing that <tt>lazarus.cfg</tt> file will ensure Lazarus keeps its config files in the nominated directory.
  
 
Alternatively you can also start the IDE from the desktop short-cut which has the <tt>--pcp=...</tt> as an argument.
 
Alternatively you can also start the IDE from the desktop short-cut which has the <tt>--pcp=...</tt> as an argument.
Line 111: Line 162:
 
=== Updating the installed version ===
 
=== Updating the installed version ===
  
It is the advantage of a version-control system such as svn that it is very easy to update the installed version to any subsequent changes.
+
It is the advantage of a version-control system such as git and svn that it is very easy to update the installed source version with any subsequent changes.
 +
 
 +
==== svn ====
  
 
* If you used TortoiseSVN right-click on the installation folder of this Lazarus and select ''SVN Update'' from the context menu.
 
* If you used TortoiseSVN right-click on the installation folder of this Lazarus and select ''SVN Update'' from the context menu.
* If you prefer the console change-dir to the installation folder and type <tt>svn update</tt>, or <tt>svn up</tt>
+
* If you prefer the console change directory (cd) to the installation folder and type <tt>svn update</tt>, or <tt>svn up</tt>
 +
 
 +
==== git ====
 +
 
 +
If you used git:
 +
 
 +
* Open a command prompt
 +
* cd to the installation folder and type <tt>git pull</tt>
  
 
The download now is very fast because only the differences to the local installation must be fetched.
 
The download now is very fast because only the differences to the local installation must be fetched.
Line 120: Line 180:
 
Then start the IDE, go to ''Tools'' > ''Build Lazarus with profile...'' and recompile the IDE. It may happen that compilation aborts with some error; in this case go to ''Tools'' > ''Configure Build Lazarus'', select ''Clean all'' and ''Switch after building to automatically'' in the "Clean up" box, and click ''Build''.
 
Then start the IDE, go to ''Tools'' > ''Build Lazarus with profile...'' and recompile the IDE. It may happen that compilation aborts with some error; in this case go to ''Tools'' > ''Configure Build Lazarus'', select ''Clean all'' and ''Switch after building to automatically'' in the "Clean up" box, and click ''Build''.
  
=== Help: The new IDE does not start. ===
+
=== Help: The new IDE does not start ===
 +
 
 
In very rare cases the new sources contain a fatal error so that the IDE does not start successfully.
 
In very rare cases the new sources contain a fatal error so that the IDE does not start successfully.
  
 
For this case you must know that the IDE always keeps a backup copy, called <tt>lazarus.exe.old</tt>. Simply delete the newly created <tt>lazarus.exe</tt> and rename <tt>lazarus.exe.old</tt> to <tt>lazarus.exe</tt>. Now you are back to work, at least with the old version.  
 
For this case you must know that the IDE always keeps a backup copy, called <tt>lazarus.exe.old</tt>. Simply delete the newly created <tt>lazarus.exe</tt> and rename <tt>lazarus.exe.old</tt> to <tt>lazarus.exe</tt>. Now you are back to work, at least with the old version.  
  
Try the installation later again, usually such catastrophic bugs are soon detected, reported and fixed. You may want to right-click on the Lazarus installation folder and select ''SVN Show Log'' from the context menu to see the commit notes of the recent changes and to learn whether the bug already has been fixed.
+
Try the installation later again, usually such catastrophic bugs are soon detected, reported and fixed.  
 +
 
 +
If you used TortoiseSVN you may want to right-click on the Lazarus installation folder and select ''SVN Show Log'' from the context menu to see the commit notes of the recent changes and to learn whether the bug already has been fixed.
 +
 
 +
If you used command line git, you can change to the source folder and type <tt>git log {{keypress|&#124;}} more</tt>
 +
to see the commit notes of the recent changes and to learn whether the bug already has been fixed.
  
 
=== What does the ''bigide'' <tt>make</tt> argument do? ===
 
=== What does the ''bigide'' <tt>make</tt> argument do? ===

Latest revision as of 07:19, 13 January 2022

Windows logo - 2012.svg

This article applies to Windows only.

See also: Multiplatform Programming Guide

Using the Windows Installer

By far the easiest and most common way to install Lazarus on Windows is to go to the official Lazarus SourceForge download site select an appropriate combined FPC/Lazarus installation package, download the latest release and launch the installer.

The current releases of the Windows Lazarus installer packages install very easily, and should work 'out-of-the-box'.

Do not install into the standard program folder c:\Program Files because access to it is restricted. Moreover, it is recommended to avoid spaces in the folder name because it may confuse some tools used by Lazarus.

If you already have another Lazarus version on your system it is recommended to keep the old version and to keep it separate from the new installation. For this purpose Lazarus offers to write its configuration files into a specific directory so that both versions can coexist. See section Preparation for the first start below.

Upgrading can be as simple as downloading the new installer and running it. You will be taken through a typical Windows installation wizard to install the FPC compiler and FPC source within the same directory structure as Lazarus IDE, and Lazarus should launch and operate without significant problems, provided you have uninstalled any previous version of Lazarus and/or FPC which was not installed with a recent version fo the Windows installer (older installations can often be found in the C:\pp directory).


Note-icon.png

Tip: It's perhaps a good idea to reboot your Windows system after you have installed Lazarus and before you try to install additional Lazarus components such as zeoslib for example.

Installing Lazarus on a Portable USB device

It is even possible to install the whole Lazarus/FPC package on a portable USB drive or memory stick (capacity at least 256 MB), for use in environments where you are not allowed to install software on your Windows workstation or where you do not have administrator privileges. You do have to be very careful about adjusting the paths in the compiler and environment options and the fpc.cfg file.

Helpfully there is a third-party Lazarus application startLazarusPortable available on GitHub in both source and compiled form to take care of this for you. startLazarusPortable is a launcher application that starts Lazarus from a folder/portable USB device and makes all the necessary configuration changes for you.

See also this forum post which (as of early February 2020) contains a fix for when you have added some packages to the Lazarus IDE from the online repository.

Installing Lazarus from sources on Windows

The following instructions are for both SubVersioN and Git repository of the Lazarus IDE. If you are not planning to follow the development source, just want a one-off, you can download a zip file of the Lazarus development source.

It is assumed that the following installations will go into folders appropriately named c:\Lazarus-fixes22 or c:\Lazarus-dev. Of course any other folder names can be used provided that they do not contain spaces or non-ASCII characters, and that the folders are fully writeable by the user. Do NOT install into c:\Program files which is not fully writeable by a user.

Getting the Lazarus sources by using TortoiseSVN

The easiest way to work with svn is by using the TortoiseSVN application (https://tortoisesvn.net/index.de.html). Install this application if you do not have it already. It adds short-cuts to the Explorer context menu from which you can work with svn easily.

To download the Lazarus fixes 2.2 sources create the folder c:\Lazarus-fixes22 and right-click on it in Explorer. In the context menu open the command SVN Checkout.... Enter the URL of the SVN repository in the corresponding box. This is:

  • https://github.com/fpc/Lazarus/branches/fixes_2_2 for the fixes version (adjust the version number in the fixes22 folder name for the current version).

Make sure that the Checkout directory box contains the directory in which you want to have the new Lazarus version (c:\Lazarus-fixes22 in our example). After pressing OK the source files are downloaded which will take some time.

Note: svn checkout of the development version (aka trunk in svn or or main in git) is problematical due to an svn bug. See below using command line svn.

Getting the Lazarus sources from the command line

Alternatively you can also download the sources from the command line if you have the command line version of SVN (https://subversion.apache.org/packages.html#windows) or GIT (https://gitforwindows.org/) on your system.

Downloading Lazarus "fixes" version source

Details of the fixes included in the Lazarus 2.2 fixes version. Here are the steps to follow to download the fixes source:

  • Open a command prompt window
  • Create a folder for the new Lazarus:
 md c:\Lazarus-fixes22
  • Change into this folder:
 cd c:\Lazarus-fixes22

Using git:

 git clone -b fixes_2_2 https://gitlab.com/freepascal.org/lazarus/lazarus.git .

Using svn:

 svn checkout https://github.com/fpc/Lazarus/branches/fixes_2_2 .
  • The download will take some time. Be patient.

Downloading Lazarus development version source

Here are the steps to follow to download the development (was known as "trunk" in SVN; now known as "main" in GIT) version source of the Lazarus IDE using svn or git:

  • Open a command prompt window
  • Create a folder for the new Lazarus:
 md c:\Lazarus-dev
  • Change into this folder:
 cd c:\Lazarus-dev

Using git:

 git clone -b main https://gitlab.com/freepascal.org/lazarus/lazarus.git .

Using svn (due to an svn bug, this is a two step process):

 svn checkout --depth files https://github.com/fpc/Lazarus/branches .
 svn update --set-depth infinity main
  • The download will take some time. Be patient.

Getting the Lazarus sources from a snapshot

A snapshot of the Lazarus development version source is available from the official GitLab repository. You can download it through the Gitlab web interface at https://gitlab.com/freepascal.org/lazarus/lazarus. Alternatively, you can fetch it from https://gitlab.com/freepascal.org/lazarus/lazarus/-/archive/main/lazarus-main.zip.

Other, previously available snapshot 'servers', are mentioned here snapshot servers. Not recommended.

Unzip the downloaded archive to the folder in which you want Lazarus to be installed, eg c:\lazarus-dev.

Building Lazarus

Prerequisite for building Lazarus is that a recent FPC installation must be available. "Recent version" means:

  • the current FPC release;
  • the previous release version;
  • the FPC fixes version; or
  • the FPC development version.

If you already have a Lazarus release installation on your disk - here you can find the FPC in the equally named folder of the installation directory. Make sure that the FPC version number is adequate. If not, install a newer Lazarus release (which is always recommended). Or, of course, you can also install FPC separately. You are also strongly recommended to install the FPC source as well, not absolutely essential but very handy.

You should also be aware that the bitness of the FPC determines the bitness of the Lazarus IDE and the bitness of the applications that you will create. So, when your fpc.exe resides in a folder i386_win32 the IDE (and your applications) will be 32-bit. When the folder is x86_64-win64 the IDE (and your applications) will be 64-bit.

  • Remember the full path to the folder containing fpc.exe and use it in the following batch file.
  • Change to the folder into which you downloaded the source files and create a batch file with the following content
set path=c:\freepascal\bin\x86_64-win64
:: Of course change this path variable to the path of your FPC compiler
make bigide
  • Executing this batch file will build a Lazarus containing all the basic packages, like in a release version. (Of course you must install any other third-party packages by yourself later.)
  • if using Powershell, try these commands (this time assuming your FPC is in c:\FPC\3.2.2 - typical of a recent install) -
$env:PATH="c:\FPC\3.2.2\bin\i386-win32"
make bigide
  • Since the Lazarus development version (trunk in svn, main in git) is not "stable" it may happen that the "bigide" version cannot be build due to an error in one of the standard packages. In this case it may be helpful to know that the basic IDE (with LCL only) can be built by using the make command without the bigide parameter:
set path=c:\freepascal\bin\x86_64-win64
:: Of course change this path variable to the path of your FPC compiler
make
  • Because the Lazarus IDE by default links to a dll-call "CreateToolhelp32Snapshot", which does not exist on the Win9x platform, the IDE will not run on Win9x out of the box. In order to make it run you have to rebuild the IDE with make -dWIN9XPLATFORM bigide.
  • Compilation will take some time again. At the end, the new IDE is ready, but you should not start it yet -- read the next section first.

Preparation for the first start

Before you start the new IDE you should make sure that it does not interfere with your current other Lazarus installation(s). For this purpose you must have a separate directory for the Lazarus configuration files, maybe c:\LazConfigs\trunk. Lazarus writes is configuration settings to this folder if you open the lazarus.exe with the argument --primary-config-path=c:\LazConfigs\dev, or shorter, --pcp=c:\LazConfigs\dev. When this parameter is missing the configuration files are read from and written to the default folder in c:\users\<your_name>\appdata\lazarus which will very probably change settings of the other installation.

Since it is easy to forget this command line parameter it is highly recommended to add a file lazarus.cfg to the lazarus installation folder (the folder containing lazarus.exe) in which the pcp parameter is listed. This is also how the Lazarus release versions handle secondary installations.

echo "--pcp=c:\LazConfigs\trunk" > lazarus.cfg Enter

Starting Lazarus in the directory containing that lazarus.cfg file will ensure Lazarus keeps its config files in the nominated directory.

Alternatively you can also start the IDE from the desktop short-cut which has the --pcp=... as an argument.

First start of the IDE

When you start the new IDE for the first time probably there will be an error message saying that the FPC and the debugger cannot be found. In this error dialog, navigate to the folder which you had used as the path to build the IDE, and select the fpc.exe. As for the debugger, navigate to the mingw folder of your Lazarus release installation (or install gdb separately) and select the gdb.exe. There may also be a message about an issue with the fppkg configuration - click "Restore fppkg configuration" to resolve this. If subsequent error messages appear they can be ignored.

Now the IDE will be happy and you can start using your new Lazarus trunk (or fixes) IDE.

Updating the installed version

It is the advantage of a version-control system such as git and svn that it is very easy to update the installed source version with any subsequent changes.

svn

  • If you used TortoiseSVN right-click on the installation folder of this Lazarus and select SVN Update from the context menu.
  • If you prefer the console change directory (cd) to the installation folder and type svn update, or svn up

git

If you used git:

  • Open a command prompt
  • cd to the installation folder and type git pull

The download now is very fast because only the differences to the local installation must be fetched.

Then start the IDE, go to Tools > Build Lazarus with profile... and recompile the IDE. It may happen that compilation aborts with some error; in this case go to Tools > Configure Build Lazarus, select Clean all and Switch after building to automatically in the "Clean up" box, and click Build.

Help: The new IDE does not start

In very rare cases the new sources contain a fatal error so that the IDE does not start successfully.

For this case you must know that the IDE always keeps a backup copy, called lazarus.exe.old. Simply delete the newly created lazarus.exe and rename lazarus.exe.old to lazarus.exe. Now you are back to work, at least with the old version.

Try the installation later again, usually such catastrophic bugs are soon detected, reported and fixed.

If you used TortoiseSVN you may want to right-click on the Lazarus installation folder and select SVN Show Log from the context menu to see the commit notes of the recent changes and to learn whether the bug already has been fixed.

If you used command line git, you can change to the source folder and type git log | more to see the commit notes of the recent changes and to learn whether the bug already has been fixed.

What does the bigide make argument do?

The bigide make argument adds a bunch of packages to Lazarus that many find useful and cannot do without. The packages that are added are:

  • cairocanvas
  • chmhelp
  • datetimectrls
  • externhelp
  • fpcunit
  • fpdebug
  • instantfpc
  • jcf2
  • lazcontrols
  • lazdebuggers
  • lclextensions
  • leakview
  • macroscript
  • memds
  • onlinepackagemanager
  • pas2js
  • PascalScript
  • printers
  • projecttemplates
  • rtticontrols
  • sdf
  • sqldb
  • synedit
  • tachart
  • tdbf
  • todolist
  • turbopower_ipro
  • virtualtreeview

The above list is sourced from the [Lazarus source directory]/IDE/Makefile.fpc and may be subject to change.

Note that if you have not compiled your own Lazarus IDE with the bigide argument, you can install any of these packages yourself using the Lazarus IDE Package > Install/Uninstall Packages... dialog.

Multiple Lazarus installs

Please see Multiple Lazarus for details on having more than one Lazarus version installed on one system. We cover issues that can arise due to multiple Lazarus installs here, because they can also happen when installing over a previous version.

Troubleshooting

Troubleshooting details that should (hopefully) be applicable across platforms may be found in the article Installation Troubleshooting.

Lazarus FAQ

The Lazarus FAQ - Frequently Asked Questions - page is available here.

Installing old versions

See Installation hints for old versions

See also