Resolving dependencies...
Configuring mtl-2.2.1...
Configuring text-1.2.2.1...
Building mtl-2.2.1...
Building text-1.2.2.1...
Installed mtl-2.2.1
Installed text-1.2.2.1
Configuring parsec-3.1.11...
Building parsec-3.1.11...
Installed parsec-3.1.11
Configuring clevercss-0.2...
Building clevercss-0.2...
Failed to install clevercss-0.2
Build log ( /home/builder/.cabal/logs/clevercss-0.2.log ):
cabal: Entering directory '/tmp/cabal-tmp-30058/clevercss-0.2'
Configuring clevercss-0.2...
Building clevercss-0.2...
Preprocessing library clevercss-0.2...
[1 of 2] Compiling Text.CSS.CleverCSSUtil ( Text/CSS/CleverCSSUtil.hs, dist/build/Text/CSS/CleverCSSUtil.o )
[2 of 2] Compiling Text.CSS.CleverCSS ( Text/CSS/CleverCSS.hs, dist/build/Text/CSS/CleverCSS.o )

Text/CSS/CleverCSS.hs:30:10: error:
    • Illegal instance declaration for ‘Applicative (GenParser toc st)’
        (All instance types must be of the form (T a1 ... an)
         where a1 ... an are *distinct type variables*,
         and each type variable appears at most once in the instance head.
         Use FlexibleInstances if you want to disable this.)
    • In the instance declaration for ‘Applicative (GenParser toc st)’
cabal: Leaving directory '/tmp/cabal-tmp-30058/clevercss-0.2'
cabal: Error: some packages failed to install:
clevercss-0.2 failed during the building phase. The exception was:
ExitFailure 1