Thanks for the responses, but my error remains. I wrote two scripts, following both different instructions. Script 1: @echo off title GTK Haskell Setup echo * Add GTK bin folder. set PATH=%PATH%;C:\Documents and Settings\User\Escritorio\GTK\GTKAIO\bin echo * Add GTK include folder. set PATH=%PATH%;C:\Documents and Settings\User\Escritorio\GTK\GTKAIO\include echo * Add GTK lib folder. set PATH=%PATH%;C:\Documents and Settings\User\Escritorio\GTK\GTKAIO\lib echo * Add Cabal bin folder. set PATH=%PATH%;C:\Documents and Settings\User\Datos de programa\cabal\bin echo * Add mingw folder. set PATH=%PATH%;C:\Archivos de programa\Haskell Platform\2010.2.0.0\mingw\bin echo * Value of PATH. echo %PATH% echo * Install GTK buildtools. cabal install gtk2hs-buildtools echo * Install GTK. cabal install gtk Script 2: @echo off title GTK Haskell Setup echo * Add pkgconfig directory for libxml. set PKG_CONFIG_PATH=%PKG_CONFIG_PATH%;C:\Documents and Settings\User\Escritorio\GTK\libmxl2\libxml2-dev_2.7.7-1_win32\lib\pkgconfig echo * Add include directory for libxml. set INCLUDE=%INCLUDE%;C:\Documents and Settings\User\Escritorio\GTK\libmxl2\libxml2-dev_2.7.7-1_win32\include echo * Add pkgconfig directory for GTK. set PKG_CONFIG_PATH=%PKG_CONFIG_PATH%;C:\Documents and Settings\User\Escritorio\GTK\Gtk+\lib\pkgconfig echo * Add libglade directory. set INCLUDE=%INCLUDE%;C:\Documents and Settings\User\Escritorio\GTK\Gtk+\include\libglade-2.0 echo * Value of PATH. echo %PATH% echo * Value of INCLUDE echo %INCLUDE% echo * Value of PKG_CONFIG_PATH echo %PKG_CONFIG_PATH% echo * Install GTK buildtools. cabal install gtk2hs-buildtools echo * Install GTK. cabal install gtk In the script 1, GTKAIO is the folder where I installed the GTK All In One. Apparently, I followed your instructions. Otherwise, what's wrong?