Resolving dependencies...
Configuring List-0.5.2...
Configuring fgl-5.5.3.0...
Building List-0.5.2...
Building fgl-5.5.3.0...
Installed List-0.5.2
Configuring mtl-2.2.1...
Building mtl-2.2.1...
Configuring utf8-string-1.0.1.1...
Installed mtl-2.2.1
Building utf8-string-1.0.1.1...
Configuring text-1.2.2.1...
Installed fgl-5.5.3.0
Building text-1.2.2.1...
Configuring regex-base-0.93.2...
Installed utf8-string-1.0.1.1
Building regex-base-0.93.2...
Installed regex-base-0.93.2
Configuring regex-posix-0.95.2...
Building regex-posix-0.95.2...
Installed regex-posix-0.95.2
Configuring regex-compat-0.95.1...
Building regex-compat-0.95.1...
Installed regex-compat-0.95.1
Installed text-1.2.2.1
Configuring hexpat-0.20.9...
Building hexpat-0.20.9...
Installed hexpat-0.20.9
Downloading hub-1.1.0...
Configuring hub-1.1.0...
Building hub-1.1.0...
Failed to install hub-1.1.0
Build log ( /home/builder/.cabal/logs/hub-1.1.0.log ):
cabal: Entering directory '/tmp/cabal-tmp-12150/hub-1.1.0'
Configuring hub-1.1.0...
Building hub-1.1.0...
Preprocessing executable 'hub' for hub-1.1.0...
[ 1 of 18] Compiling Version          ( Version.hs, dist/build/hub/hub-tmp/Version.o )
[ 2 of 18] Compiling Hub.Prog         ( Hub/Prog.hs, dist/build/hub/hub-tmp/Hub/Prog.o )
[ 3 of 18] Compiling Hub.Poss         ( Hub/Poss.hs, dist/build/hub/hub-tmp/Hub/Poss.o )

Hub/Poss.hs:17:10: error:
    • No instance for (Applicative (Poss e))
        arising from the superclasses of an instance declaration
    • In the instance declaration for ‘Monad (Poss e)’
cabal: Leaving directory '/tmp/cabal-tmp-12150/hub-1.1.0'
cabal: Error: some packages failed to install:
hub-1.1.0 failed during the building phase. The exception was:
ExitFailure 1