Resolving dependencies...
Configuring mtl-2.2.1...
Configuring network-2.6.3.1...
Building mtl-2.2.1...
Building network-2.6.3.1...
Configuring old-locale-1.0.0.7...
Installed mtl-2.2.1
Building old-locale-1.0.0.7...
Configuring time-locale-compat-0.1.1.3...
Installed old-locale-1.0.0.7
Building time-locale-compat-0.1.1.3...
Configuring utf8-string-1.0.1.1...
Installed time-locale-compat-0.1.1.3
Building utf8-string-1.0.1.1...
Configuring text-1.2.2.1...
Installed network-2.6.3.1
Building text-1.2.2.1...
Installed utf8-string-1.0.1.1
Configuring old-time-1.1.0.3...
Building old-time-1.1.0.3...
Configuring tagsoup-0.8...
Installed old-time-1.1.0.3
Building tagsoup-0.8...
Failed to install tagsoup-0.8
Build log ( /home/builder/.cabal/logs/tagsoup-0.8.log ):
cabal: Entering directory '/tmp/cabal-tmp-24218/tagsoup-0.8'
Configuring tagsoup-0.8...
Building tagsoup-0.8...
Preprocessing library tagsoup-0.8...
[ 1 of 14] Compiling Text.StringLike  ( Text/StringLike.hs, dist/build/Text/StringLike.o )

Text/StringLike.hs:47:10: error:
    • Illegal instance declaration for ‘StringLike String’
        (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 ‘StringLike String’
cabal: Leaving directory '/tmp/cabal-tmp-24218/tagsoup-0.8'
Installed text-1.2.2.1
Configuring xml-1.3.14...
Building xml-1.3.14...
Installed xml-1.3.14
Configuring feed-0.3.12.0...
Building feed-0.3.12.0...
Installed feed-0.3.12.0
cabal: Error: some packages failed to install:
download-0.3.1 depends on tagsoup-0.8 which failed to install.
tagsoup-0.8 failed during the building phase. The exception was:
ExitFailure 1