Installing gtk2hs - haskell

Question

I've installed gtk2hs-buildtools with no problem, but here's the output when I try to install gtk using 'cabal install gtk':
[gautam#gautam ~]$ cabal install gtk
Resolving dependencies...
[1 of 2] Compiling SetupWrapper ( /tmp/cairo-0.12.213784/cairo-0.12.2/SetupWrapper.hs, /tmp/cairo-0.12.213784/cairo-0.12.2/dist/setup/SetupWrapper.o )
[2 of 2] Compiling Main ( /tmp/cairo-0.12.213784/cairo-0.12.2/Setup.hs, /tmp/cairo-0.12.213784/cairo-0.12.2/dist/setup/Main.o )
Linking /tmp/cairo-0.12.213784/cairo-0.12.2/dist/setup/setup ...
[1 of 2] Compiling Gtk2HsSetup ( Gtk2HsSetup.hs, dist/setup-wrapper/Gtk2HsSetup.o )
[2 of 2] Compiling Main ( SetupMain.hs, dist/setup-wrapper/Main.o )
Linking dist/setup-wrapper/setup ...
Cannot find gtk2hsC2hs
Please install `gtk2hs-buildtools` first and check that the install directory is in your PATH (e.g. HOME/.cabal/bin).
[1 of 2] Compiling SetupWrapper ( /tmp/glib-0.12.213784/glib-0.12.2/SetupWrapper.hs, /tmp/glib-0.12.213784/glib-0.12.2/dist/setup/SetupWrapper.o )
[2 of 2] Compiling Main ( /tmp/glib-0.12.213784/glib-0.12.2/Setup.hs, /tmp/glib-0.12.213784/glib-0.12.2/dist/setup/Main.o )
Linking /tmp/glib-0.12.213784/glib-0.12.2/dist/setup/setup ...
[1 of 2] Compiling Gtk2HsSetup ( Gtk2HsSetup.hs, dist/setup-wrapper/Gtk2HsSetup.o )
[2 of 2] Compiling Main ( SetupMain.hs, dist/setup-wrapper/Main.o )
Linking dist/setup-wrapper/setup ...
Cannot find gtk2hsC2hs
Please install `gtk2hs-buildtools` first and check that the install directory is in your PATH (e.g. HOME/.cabal/bin).
cabal: Error: some packages failed to install:
cairo-0.12.2 failed during the configure step. The exception was:
ExitFailure 1
gio-0.12.2 depends on glib-0.12.2 which failed to install.
glib-0.12.2 failed during the configure step. The exception was:
ExitFailure 1
gtk-0.12.2 depends on glib-0.12.2 which failed to install.
pango-0.12.2 depends on glib-0.12.2 which failed to install.
[gautam#gautam ~]$
This problem occurs on both my Mac and in my Fedora VM. Does anybody know how to fix this? Thanks!

Answer 1

You need to add the path in which the Gtk2Hs build tools are stored to your $PATH environment variable, so that the build process can find them. On Linux, it's $HOME/.cabal/bin. On OS X, it's $HOME/Library/Haskell/bin (although that might just be if you're using the Haskell Platform — if that doesn't work, try $HOME/.cabal/bin).
To add a directory to your $PATH, run export PATH=directory:$PATH. You should probably add this to your shell's startup file (it depends on your shell and OS — probably either ~/.bashrc, ~/.profile or ~/.bash_profile). (You'll need to do so if you want to run any programs you install with cabal directly, anyway.)