1 For the very lazy
You need to have wxWidgets 2.8.10 installed on your machine (and compiled with MSYS g++ if using Windows). Windows users should also get the Windows port of wx-config.
You have correctly configured all of the recommended wxWidgets environment variables, and have a recent version of GHC with an up to date cabal install.
This is all you need:
> cabal install wx
(but if you plan to use styledTextCtrl, check here)
2 Supported Configurations
The build process has been tested against three main platforms:
- unix-gtk. General unix systems with GTK.
- macosx. Mac OS X.
- windows. General windows systems (i.e. win95 to winXP).
We support building only with the gnu mingw32 C compiler (windows-mingw).
Please note that we have discontinued support for Microsoft compilers in the build system.
wxHaskell has been built successfully on (at least) the following configurations:
- windows. Windows 98, windows 2000, and windowsXP, using wxMSW 2.8.x.
- macosx. Mac OS X 10.4 (Tiger) and 10.5 (Leopard) with ghc 6.10.x and wxMAC 2.8.x.
- unix-gtk. Red Hat Linux 10 (Fedora), FreeBSD, and Gentoo Linux, using wxGTK 2.8.x.
(Unfortunately, there are still build problems on Sun Solaris – we are looking for build volunteers :-)
Ensure you have a recent GHC compiler – version 6.10.3 or higher is recommended. In principle, any Haskell98 compiler that supports the standard FFI libraries along with cabal install should work. We have discontinued support for building without cabal.
- Windows: You will need wx-config for Windows, MinGW 5.1.6 and MSYS 0.1.11 (these are the latest versions at the time of writing). You must select the C++ compiler option when installing MinGW.
- Mac OS X: you need to install the gcc compiler, which is part of the Apple Developer Tools. These tools are shipped with Panther and are installed by invoking Applications/Installers/Developer Tools/Developer.mdmg.
You should install the current stable version (2.8.10) of wxWidgets for your platform - versions older than 2.8.1 are no longer supported. Build instructions are given for Windows - on most other platforms you should be able to obtain wxWidgets using your package manager (you may need -developer packages).
We assume in this guide that the variable $wxwin points to your wxWidgets installation directory, for example: ~/dev/wxGTK-2.8.10.
4 Getting wxWidgets
wxHaskell 0.12.x.x supports wxWidgets > 2.8.
- You will need to build using the MinGW compiler - instructions below.
- Mac OS X
- Tiger - do not use the wxMac 2.5 that comes pre-installed.
- Leopard - wxHaskell now supports wxWidgets 2.8.
- Linux - the wxWidgets that ships with your system (as long as it's the 2.8 one and not the 2.6 one) should work.
- Backport of wxWidgets 2.8 for Debian and Ubuntu
- wxGTK - wxhaskell supports wxGTK.
- wxX11 - wxhaskell does not support wxX11 now. Use wxGTK instead.
See the wxWidgets site for more details.
4.1 building wxWidgets
4.2 On Windows
Note: Microsoft compilers are no longer supported. The cabal build system cannot understand the output of wx-config for Microsoft compilers.
Note: The Haskell Platform 2010.1.0.0 installer shipped without C++ support. If you want to build wxHaskell on Windows using this Haskell Platform, please see 
Using the MSYS shell, and making sure that you have the C++ compiler oiption installed for MinGW (it is 'not' the default):
> cd /c/path/to/wxWidgets-2.8.10/build/msw > mingw32-make -f makefile.gcc BUILD=release MONOLITHIC=1 SHARED=1 UNICODE=1
That's it! A DLL is generated in /c/path/to/wxWidgets/gcc_dll, which you will need to copy to a location where it can be found when running your executables.
4.3 On Unix systems
You should follow the instructions on the wxWidgets website if there are no suitable packages for your environment. You probably want to use GCC to build wxWidgets, as this makes it more likely that cabal will understand the output of wx-config.
On most Unix platforms, wxWidgets build goes something like: create a mybuild directory in the wxWidgets directory, and run configure and make from that directory (and take the time to get some coffee :-).
> cd $wxwin > mkdir mybuild > cd mybuild > ../configure --enable-unicode > make > make install > cd ../contrib/src > make > make install
4.4 Testing wxWidgets build
Now try out a few samples of wxWidgets to see if it all works correctly:
> cd ../../samples/controls > make > ./controls
Note that you build from the local samples directory that resides in the mybuild directory.
And also try if wx-config works too:
> wx-config --version
5 Building wxHaskell
Since wxHaskell 0.12.1.1, we only support building using Cabal.
For all platforms, provided that wx-config is somewhere in the path and that the WXWIN environment variable points to the root of your wxWidgets installation installation is very straightforward.
On Windows platforms, you may also need to set WXCFG=gcc_dll/mswu. You can then install wxhaskell as follows (in a Windows cmd.exe shell, not an MSys shell):
> cabal update > cabal install wx
Note that on Windows 7 machines, your command window must be running as Adminstrator.
Note that on Unix systems, you may prefer something like
> sudo cabal install --global wx
Windows developers who don't update environment variables can do something like this in an MS-DOS shell:
> Set CPLUS_INCLUDE_PATH=C:\MinGW\include\c++\3.4.5;C:\MinGW\include\c++\3.4.5\mingw32\ > Set WXWIN=C:\path\to\wxWidgets-2.8.10 > Set WXCFG=gcc_dll\mswu > cabal install wx
The Windows installation is global by default.
5.1 Out of memory errors
There have been reports of out of memory errors when compiling wxcore on some machines, notably 64 bit Linux hosts. Wxcore contains some very large autogenerated source files, and increasing the memory available to the GHC runtime can help.
Try something like:
> export GHCRTS='-M512m'
to allocate 512MB to the GHC RTS. This has been reported to be sufficient.
6 Source Release
You can obtain a source release of wxHaskell from the darcs repository. Darcs creates a wxhaskell directory for you; we assume in the following example that your $wxhaskell directory will be ~/dev/wxhaskell.
> cd ~/dev > darcs get --partial --set-scripts-executable http://code.haskell.org/wxhaskell/
You then build each of the key components in order:
> cd ~/dev/wxhaskell/wxdirect > cabal install > cd ../wxcore > cabal install > cd ../wx > cabal install
7 Test wxHaskell
If everything succeeded, you should be able to run a test program.
> cd samples/wx > ghc -package wx -o helloworld HelloWorld.hs > ./helloworld
macosx: wxHaskell programs need to be turned into application bundles before they can be run. Look at the Mac OS X notes for more information. You can also run the examples from GHCi – a great development environment!
> ghci -package wx BouncingBalls.hs > main
wxHaskell programs are not always properly reïnitialized when started the second time from a GHCi prompt. This is due static variables in the wxWidgets C++ code, and we are working with wxWidgets developers to remove those bugs. Currently, GHCi only works well with wxWidgets 2.4.2.
gtk: Unfortunately, one can only start a wxWidgets program once with GHCi on GTK (rendering it useless).
macosx. You need to use a special command to run wxHaskell applications, see the Mac OS X notes from more information.