Resolving dependencies...
Configuring mtl-2.2.1...
Configuring primitive-0.6.1.0...
Building mtl-2.2.1...
Building primitive-0.6.1.0...
Installed mtl-2.2.1
Configuring random-1.1...
Configuring text-1.2.2.1...
Installed primitive-0.6.1.0
Building random-1.1...
Building text-1.2.2.1...
Configuring utf8-string-1.0.1.1...
Installed random-1.1
Building utf8-string-1.0.1.1...
Configuring vector-0.11.0.0...
Installed utf8-string-1.0.1.1
Building vector-0.11.0.0...
Installed text-1.2.2.1
Configuring hashable-1.2.4.0...
Building hashable-1.2.4.0...
Installed hashable-1.2.4.0
Installed vector-0.11.0.0
Configuring hashtables-1.2.1.0...
Building hashtables-1.2.1.0...
Installed hashtables-1.2.1.0
Configuring gtk2hs-buildtools-0.13.2.1...
Building gtk2hs-buildtools-0.13.2.1...
Installed gtk2hs-buildtools-0.13.2.1
Configuring cairo-0.13.3.1...
Configuring glib-0.13.4.1...
Building cairo-0.13.3.1...
Building glib-0.13.4.1...
Installed cairo-0.13.3.1
Installed glib-0.13.4.1
Configuring gio-0.13.3.1...
Configuring pango-0.13.3.1...
Building gio-0.13.3.1...
Building pango-0.13.3.1...
Installed pango-0.13.3.1
Installed gio-0.13.3.1
Configuring gtk-0.13.9...
Failed to install gtk-0.13.9
Build log ( /home/builder/.cabal/logs/gtk-0.13.9.log ):
cabal: Entering directory '/tmp/cabal-tmp-3486/gtk-0.13.9'
cabal: Leaving directory '/tmp/cabal-tmp-3486/gtk-0.13.9'
cabal: Error: some packages failed to install:
gtk-0.13.9 failed during the configure step. The exception was:
user error ('/opt/ghc/8.0.2/bin/ghc' exited with an error:

/tmp/cabal-tmp-3486/gtk-0.13.9/SetupWrapper.hs:60:49: error:
Ambiguous occurrence ‘exeExtension’
It could refer to either ‘Distribution.Simple.BuildPaths.exeExtension’,
imported from ‘Distribution.Simple.BuildPaths’ at
/tmp/cabal-tmp-3486/gtk-0.13.9/SetupWrapper.hs:11:40-51
or ‘System.Directory.exeExtension’,
imported from ‘System.Directory’ at
/tmp/cabal-tmp-3486/gtk-0.13.9/SetupWrapper.hs:23:1-23
(and originally defined in
‘directory-1.2.6.2:System.Directory.Internal.Config’)
)
gtksourceview2-0.13.2.1 depends on gtk-0.13.9 which failed to install.