Installing Lazarus on macOS

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Revision as of 11:06, 5 February 2019 by Mischi (talk | contribs) (Step 4 FPC, FPC Source and Lazarus)

This article applies to macOS only.

See also: Multiplatform Programming Guide

Template:Installing Lazarus on MacOS X

Installing Lazarus on a Mac is not particularly difficult but is a bit tedious. Its critical that you do the install in the correct order. Skipping steps will almost certainly lead to tears. In brief, here is what you do -

  1. Download and install Xcode.
  2. Install the global command line tools for Xcode.
  3. Install gdb - sort of but not really optional.
  4. Install Free Pascal Compiler, FPC Source and Lazarus
  5. Speak to Lazarus about gdb.


The detailed instructions assume a recent version of OSX on you Mac, a recent version of Xcode from Apple and recent version of Lazarus. Further down the page, under Legacy Documentation, you will see older information that may be relevant if you are using older components. You can assist by replacing out of date info, either deleting it, or, if it may help someone working with a legacy project, moving it to bottom of the page.

In general, this is about using the Carbon Widget Set, it is intentionally (by Apple) limited to 32 bits and we have every reason to believe Apple may drop support for it some time in the not too distant future. The alternative is Cocoa, more information to be provided.

Step 1. Download Xcode.

You need the Apple Developer tools, which are a part of the XCode development environment. They can be installed from the original Mac OS X installation disks or or a possibly newer copy downloaded from the Apple Developer Connection (ADC), which requires free registration: Download the Xcode file, it will end up in your Downloads directory as an xip file. September 2017 it is Xcode_9_beta_6.xip, about 5G. Click it. It is unarchived into your Downloads directory. You may be happy with it there but maybe not. Other users will see the path to it but be unable to use it. And its untidy there. So I moved mine and then told xcode-select where it was moved to (in a terminal) -

mv Downloads/ /Developer/.
sudo xcode-select -s /Developer/

Step 2. Xcode Command Line Tools

This is shown here as a separate step because it really is a separate step in addition to Step 1. Don't confuse this with the internal Xcode command line tools that the Xcode GUI will tell you are already installed. Lazarus cannot use those Xcode internal command line tools, so do the following (its quick and easy)-

xcode-select --install

Since macOS Mojave you need to install the DSK headers as well:

open /Library/Developer/CommandLineTools/Packages/macOS_SDK_headers_for_macOS_10.14.pkg

Step 3 install gdb

While this is really optional, I suggest you do need gdb in most cases and I recommend this step. Alternatives include -

Getting gdb to run can be a bit tedious but is worthwhile in the end. I recommend this approach

  1. Install fink or brew and use them to install gdb-
  2. Self sign the gdb binary using tools already on your Mac - This is the tedious part. The instructions are clear except, perhaps they could have mentioned that after you have set the Keychain to ’System’ you need click ‘Create’ and ‘Done’ on the next screen. Then go and find the cert in your overall list of certs to do the next instruction “using the contextual menu…”. Don’t worry about step “2.1.4 Disable starting the debuggee…”, we’ll address that once Lazarus itself is installed and working.
  3. Once Lazarus is installed and fired up, tell it how it should start gdb, that is step 5.

Note that as of April 2018, there may be issues with newest gdb and High Sierra.,40874.0.html According to, gdb 8.1 does not work on High Sierra, but 8.0.1 does.

Step 4 FPC, FPC Source and Lazarus (disk images or fink)

Get and install, in this order, the FPC, FPC Source, Lazarus. Get release version of all three from Link . As these install kits are not approved by Apple, you need to hold down the Control key, click the package and choose Open and confirm you want to install from an Unknown Developer (i.e. one who does not pay Apple a kickback).

Alternatively, you can use fink, a package manager for Mac OS X. The extra bonus of fink is easy installation as well as clean removal of a huge number of other open source software packages, including FreePascal crosscompilers for many processors and systems. The choice for lazarus is between a carbon look of lazarus (preferred by most), a gtk2 look, a Qt4-based and a Qt5-based version:

$ fink install lazarus-aqua


$ fink install lazarus-gtk2


$ fink install lazarus-qt4


$ fink install lazarus-qt5

You will be asked, whether to install a number of dependencies, including the FreePascal compiler, the lazarus sources. Simply hit RETURN at the prompt and go for a coffee. It may take quite some time to build all packages, in particular on older Macs.

After installation, Lazarus can be started from the folder /Applications/Fink/. The actual details of fpc and lazarus are in subdirectories of /sw

With any lazarus package from fink, these widget sets are supported for your program on macOS:

carbon (Aqua), gtk2, qt4 (Aqua), qt5 (Aqua), nogui, win32, win64 and wince.

Step 5 Tell Lazarus about starting gdb

OK, now you should be able to start Lazarus, it should display the various parts and paths it needs (including gdb) in the little opening screen. You will get an alert there if you chose to not use a debugger. Proceed to the IDE and we now need to tell Lazarus to tell gdb to not open a shell, as noted by a number of Forum people (,37310.0.html). Within Lazarus, click Tools->Options->Debugger->General In the “Debugger specific Options” there is a field labeled Debugger_Startup_Options. Type in "--eval-command=set startup-with-shell off" (including the inverted commas) AND press the return key, click OK. Note you cannot copy and paste into this box (##$!). See screen shot.

Now, try the Run test ! The first time in a debugging session, expect a warning and then a logon box where you need put in your password as the debugger starts up. Annoying but its all fine after that.

For authorative/more detailed instructions for FPC, please go to [1]


Not every combination of Lazarus and Free Pascal is compatible with every installation of Mac OS X. Please refer to the following table in order to find the correct version for your development environment:

Lazarus Compatibility Matrix
Lazarus 1.8.x Lazarus 2.0.y Lazarus 2.2.0 RC1
FPC 3.0.4 FPC 3.2.0 FPC 3.2.2
PPC processors
Mac OS X 10.4 (Tiger) Incompatible Incompatible Incompatible Incompatible Incompatible Incompatible Incompatible
Mac OS X 10.5 (Leopard) Not tested Not tested Incompatible Incompatible Incompatible Incompatible Incompatible
Intel processors
Mac OS X 10.4 (Tiger) Incompatible Incompatible Incompatible Incompatible Incompatible Incompatible Incompatible
Mac OS X 10.5 (Leopard) Not tested Compatible^ Not tested Compatible^**† Not tested Not tested Not tested
Mac OS X 10.6 (Snow Leopard) Compatible Compatible^^ Not tested Not tested Not tested Not tested Not tested
Mac OS X 10.7 (Lion) Compatible Not tested Not tested Not tested Not tested Not tested Not tested
OS X 10.8 (Mountain Lion) Compatible^^ Compatible Compatible**# Compatible**# Not tested Not tested Not tested
OS X 10.9 (Mavericks) Compatible^^ Compatible Compatible**† Compatible**† Not tested Not tested Not tested
OS X 10.10 (Yosemite) Compatible^^ Compatible Compatible**† Compatible**† Not tested Not tested Not tested
OS X 10.11 (El Capitan) Compatible^^ Compatible Compatible***† Compatible† Compatible## Not tested Not tested
macOS 10.12 (Sierra) Compatible^^ Compatible Compatible***† Compatible† Compatible† Compatible† Not tested
macOS 10.13 (High Sierra) Not tested Compatible Compatible***† Compatible† Compatible† Compatible† Not tested
macOS 10.14 (Mojave) Not tested Compatible Compatible***† Compatible† Compatible† Compatible† Compatible
macOS 10.15 (Catalina) Not tested Compatible Compatible***† Compatible† Compatible† Compatible† Compatible
macOS 11.0 (Big Sur) Not tested Compatible Compatible***† Compatible† Compatible† Compatible† Compatible
macOS 12.0 (Monterey Beta) Not tested Not tested Not tested Not tested Not tested Not tested Compatible
Apple Silicon processors
macOS 11.0 (Big Sur) Not tested Not tested Not tested Compatible†† Compatible†† Compatible††† Compatible*

x = 0, 2 or 4; y = 0, 2, 4, 6, 8, 10 or 12

^ Carbon interface compiles - Cocoa does not.

^^ Restrictions apply to debugging with gdb.

** See Installing Lazarus 2.0.8, 2.0.10 with FPC 3.2.0 for macOS 10.10 and earlier for instructions.

*** See Installing Lazarus 2.0.8 with FPC 3.2.0 for macOS 10.11+ for instructions.

# Cannot run with/without debugging in the IDE. Can run compiled application outside of the IDE. See Issue #37324

## You need to compile FPC 3.2.0 from source with FPC 3.0.4 which is installed with the Lazarus 2.0.12 packages.

† Cannot "run without debugging" in the IDE. Can run compiled application outside of the IDE. See Lazarus IDE - Unable to "run without debugging" for workaround. See Issue #36780.

†† You need to compile a native aarch64 version of FPC 3.3.1 (trunk) and Lazarus 2.0.12 from source to support an Apple Silicon M1 processor. Refer to these instructions for FPC and these instructions for the Lazarus IDE.

††† After installing FPC 3.2.2, you need to compile a native aarch64 version of Lazarus from source to support an Apple Silicon M1 processor. Refer to these instructions for compiling the Lazarus IDE.

* Lazarus 2.2 Release Candidate 1 installs universal binaries for FPC 3.2.2, but an Intel Lazarus IDE binary which you can use or recompile the IDE from within itself for a native aarch64 version. This may change when Lazarus 2.2 is officially released.

Carbon and Cocoa

At present (late 2017) Lazarus using Carbon is a pretty good experience, things work pretty much as expected. However, it must be remembered that Carbon is intentionally limited (by Apple) to 32 bits and there is every reason to believe it might be dropped altogether in a later release of OSX. The alternatives include Cocoa, QT and GTK2+. The latter two require additional libraries and GTK2+ on the Mac appears to get little attention these days. QT on the Mac does have some strong supporters on the forum.

However, Cocoa is generally recognized as the future. Its possible to build an all Cocoa version of Lazarus but at time of writing, it does not look very usable. Its also possible to make a Cocoa install and use that at the command line to compile an existing project, probably put together in a Carbon based Lazarus. Such a project will then be using the Cocoa widget set and could be 64bit.

A good tutorial is available at Its specifically about using a particular Cocoa only Component but provides clear instructions that can be used generally.

Download the sources via svn

  • Note: IF the current SVN of FreePascal can not be compiled using the stable release of FreePascal that comes with the current stable version of Lazarus (FPC 2.6.*), you will need a newer compiler. In order to compile the latest versions of FPC, first install a precompiled 2.6.* series compiler. You can get a compiled version of FPC 2.6.* at Note: only do this if the instructions below do not work.

The sources are kept in a version control system called subversion or short svn:

  • 10.5 and higher already contains svn clients. Users of earlier versions must install SVN for Mac OS X. A good package is provided by Martin Ott. You can also use fink. SVN clients with GUI (graphical user interface) are available from Versiontracker. A quite handy client, which integrates in Finder, is SCPlugin.

Create a directory, where you would like to put the sources. You don't need to be root to do this. Any normal user can do this. First create a directory for fpc

(e.g. /Users/username/freepascal)

then open a terminal and do the following:

[]$ svn co fpc

This will create a directory called 'fpc', which can be later used in the IDE. Hint: To download/update the latest changes you can simply do

[]$ cd /Users/username/freepascal/fpc
[]$ svn up

Building fpc

[]$ make clean all
[]$ sudo make install

Then download lazarus

[]$ svn co lazarus

This will create a directory called 'lazarus'. To update the latest changes:

[]$ cd /Users/username/freepascal/lazarus
[]$ svn up

Building lazarus

[]$ make clean all

Then start lazarus either via command line or by double click in the finder:


Download stable sources

Source code of stable versions is available in the Lazarus Zip - GZip archives. This is e.g. an option for users, who want to run the latest official Lazarus versions on "unsupported" machines, e.g. PPC-based Macs. Provided that you have installed the latest stable FPC version together with sources, it is sufficient to download and unpack the zip archive. Move it to the desired location (e.g. your /Developer folder), open a terminal window and change the shell's path to this folder (the easiest way to do this is to type "cd " and then to drag the icon of the freshly unpacked Lazarus folder to the position after this command in the Terminal window). If necessary enter <return> and then

[]$ make clean bigide

and <return> again. Subsequently, Free Pascal will use the makefile in this folder to build the Lazarus IDE. This may take a few minutes, but the process is fully automated. Therefore, you might want to look for a cup of coffee, while FPC is working. If the compiler is ready it prints the number of processed lines and the required time to the shell's output.

The last step is to right-klick on the Lazarus bundle icon and to select "Show Package Contents" from the context menu. Then drag the executable "lazarus" to the folder "Contents/MacOS" of the bundle. That's it.

Legacy Information

XCode Compatability

Information relating to older versions of FPC, Lazarus and Apple Developer Tools

Compatibility with Xcode 5.0 and newer versions (Mac OS X 10.8, 10.9, 10.10 and 10.11)

Like Xcode 4.3+, Xcode 5 and subsequent versions no longer install the command line tools by default. These are required by FPC/Lazarus, however. Unlike in Xcode 4 the installation option is no longer accessible in Xcode 5 via the Downloads tab. Additionally, the "Locations" tab of the preferences dialog may be confusing, as it mentions that the command line tools are installed:

The first dialog box shows that by default the command line tools are only installed inside the bundle itself. To install them globally, as required by FPC/Lazarus, execute the following terminal command:

xcode-select --install

Depending from your Xcode version alternative steps to install the command line developer tools may be to download them directly in the Xcode preferences window (see screenshots above) or to download them from (please take care to install the command line tools that are correct exactly for your Xcode version).

Xcode 4.3+ compatibility (Mac OS X 10.7/10.8)

Xcode 4.3 and later no longer install the command line tools by default. These are required by FPC/Lazarus.

To install them manually, open Xcode, go to Preferences, select "Downloads;" and install the "Command Line Tools". Afterwards, FPC will install and function correctly.

It will be necessary to reinstall the command line tools after each upgrade of Xcode (especially when it's a new major version, the installer may delete the old copies of the command line tools), and also after switching to a new major version of the system software (idem). You may also download the command line tools from Apple Developer.

Xcode 3.2.x compatibility (Mac OS X 10.6)

FPC 2.6.0: there is an issue when compiling dynamic libraries with FPC under Mac OS X 10.6 due to a bug in the Xcode 3.2.x linker. This bug has been fixed in Xcode 4. You can work around the bug in Xcode 3.2.x by using the -k-no_order_inits command line parameter when compiling a dynamic library.

Xcode 3.1.x compatibility (Mac OS X 10.5)

Most versions of Lazarus and FPC are compatible with Xcode 3.1 (see the compatibility matrix for detailed reference). The Xcode integration kit is provided as an optional install to allow for developing with Free Pascal directly from Xcode. It is not required for development with Lazarus, however.

Xcode 2.x compatibility (Mac OS X 10.4)

Most versions of Lazarus and FPC are compatible with Xcode 2.3 or newer (see the compatibility matrix for detailled reference). The Xcode integration kit is provided as an optional install to allow for developing with Free Pascal directly from Xcode. It is not required for development with Lazarus, however. Xcode 2.0 was compatible with Lazarus 0.9.x, but it is no longer supported by newer versions of the Lazarus IDE.

Install Packages / Released version

Installation from disk images

Download the three disk images (.dmg files) for fpc, fpcsrc and lazarus from either of the following links:

Open up each disk image and install in this order:

  1. fpc
  2. fpcsrc
  3. Lazarus

After installation the Lazarus application can be found in /Developer/lazarus/, the FPC source files in /usr/local/share/fpcsrc.

If you receive a "Can't find unit Interfaces used by Project1" error on trying to compile a blank form, check the following settings in Lazarus (should be set by default):

Environment Options

  Lazarus directory: /Developer/lazarus
  Compiler path: /usr/local/bin/ppc386 (PowerPC Macs: /usr/local/bin/ppcppc)
  FPC Source: /usr/local/share/fpcsrc

Project | Options

  All paths blank
  LCL Widget Type: default (Carbon beta)

Project | Inspector

  Required Packages

Note - different versions of Lazarus depend on particular versions of the FreePascal compiler and will not work with other versions.

Another common problem is that the versions of fpc and fpcsrc are different.

This is the easiest way to install Lazarus on Mac OS X.

Install from Source / Development version

You need the latest stable released FPC installed in order to compile the development version.

Download and install a compiler

Download and install the FPC package:

There are two development versions of the compiler: 2.6.x is stable version without new features - only bug fixes. The unstable version 2.7.x comes with lots of new features but sometimes also with bugs. Best is to download and install fpc 2.6.x. Some daily snapshots can be found here. Keep in mind that these are daily snapshots and that you can have bad luck and get a buggy version. The probability is about 1:30. So if the version is buggy try another day or use the released packages instead.

Uninstalling Lazarus and Free Pascal

Installed using fink

The complete uninstall of all fpc and lazarus packages is done with:

fink purge --recursive fpc-config

If you want to preserve changes to the preference file /sw/etc/fpc.cfg, do:

fink remove --recursive fpc-config

For the removal of the Lazarus preference folder and files in your home directory, see below ( Lazarus preference folder).

Installed from disk images or sources

Normally you uninstall an application on OS X simply by dragging it from the Applications folder to the trash. But because Lazarus and Free Pascal are development tools, they're installed in several folders that you don't normally see in Finder.

You can copy and save the commands below to file and run it if you need to uninstall Lazarus and Free Pascal. You can usually install newer versions of Lazarus and Free Pascal over older versions, but as with most software it's not a bad idea to clean out everything before you install a newer version. This list of commands should also give you a sense of where the various pieces of Lazarus and Free Pascal are located.


rm -fv $bin/ppcppc
rm -fv $bin/ppc386
rm -fv $bin/bin2obj
rm -fv $bin/data2inc
rm -fv $bin/delp
rm -fv $bin/fd2pascal
rm -fv $bin/fpc
rm -fv $bin/fpcmake
rm -fv $bin/fpcmkcfg
rm -fv $bin/fpcsubst
rm -fv $bin/fpdoc
rm -fv $bin/fprcp
rm -fv $bin/h2pas
rm -fv $bin/h2paspp
rm -fv $bin/makeskel
rm -fv $bin/mkxmlrpc
rm -fv $bin/plex
rm -fv $bin/postw32
rm -fv $bin/ppdep
rm -fv $bin/ppudump
rm -fv $bin/ppufiles
rm -fv $bin/ppumove
rm -fv $bin/ptop
rm -fv $bin/pyacc
rm -fv $bin/rstconv
rm -fv $bin/unitdiff
rm -r $private/lazarus
rm -r $bin/lazarus
rm -r $share/lazarus
rm -r $share/fpcsrc
rm -r $share/doc/fpc-2.2.2
rm -r $share/examples/fpc-2.2.2

rm -r $lib/fpc

rm -r $receipts/lazarus-*.pkg
rm -r $receipts/fpcsrc-*.pkg
rm -r $receipts/fpc-*.pkg

rm -fv /etc/fpc.cfg

Note that this assumes you have version 2.2.2 snapshot of Free Pascal installed. If you have a different version, change the two relevant commands to specify your version.

To run this script, change to the directory where it's stored and enter:

chmod +x
sudo ./

Then enter your password when prompted.

Lazarus preference folder .lazarus in the home directory

Note: Lazarus also creates a .lazarus folder in your home directory where it stores environment settings and a list of recently opened projects and files. You can leave this folder alone if you want the new version of Lazarus you're installing to use your old settings. OS X normally doesn't show files or folders whose names start with a dot (.). To see this folder and its contents, enter the following in a terminal window:

cd ~/
ls -al
cd .lazarus

To remove it, execute the following commands:

cd ~/
rm -rv .lazarus

Known issues

  • FPC 2.4.4 has a bug. You can not compile the IDE with the range check flag -Cr.
  • On OS X 10.4 you have to manually uninstall any previous version before installing a new dmg. Delete the following files and folders:
    • /Developer/lazarus
    • /Library/Receipts/lazarus.pkg
    • /etc/lazarus
    • /usr/local/bin/lazbuild

See Also

Other Interfaces

Platform specific Tips

Mac How To Articles

  • Mac How - If you having troubles in solving some major issues.

Interfaces Development Articles