Resolving dependencies...
Configuring call-stack-0.1.0...
Configuring mtl-2.2.1...
Building call-stack-0.1.0...
Building mtl-2.2.1...
Configuring text-1.2.2.1...
Installed call-stack-0.1.0
Building text-1.2.2.1...
Configuring HUnit-1.5.0.0...
Installed mtl-2.2.1
Building HUnit-1.5.0.0...
Installed HUnit-1.5.0.0
Installed text-1.2.2.1
Configuring parsec-3.1.11...
Building parsec-3.1.11...
Installed parsec-3.1.11
Downloading Folly-0.1.4.2...
Configuring Folly-0.1.4.2...
Building Folly-0.1.4.2...
Failed to install Folly-0.1.4.2
Build log ( /home/builder/.cabal/logs/Folly-0.1.4.2.log ):
cabal: Entering directory '/tmp/cabal-tmp-26093/Folly-0.1.4.2'
Configuring Folly-0.1.4.2...
Building Folly-0.1.4.2...
Preprocessing library Folly-0.1.4.2...
[1 of 7] Compiling Folly.Utils      ( src/Folly/Utils.hs, dist/build/Folly/Utils.o )
[2 of 7] Compiling Folly.Lexer      ( src/Folly/Lexer.hs, dist/build/Folly/Lexer.o )

src/Folly/Lexer.hs:7:1: error:
    Failed to load interface for ‘Text.Parsec.Pos’
    It is a member of the hidden package ‘parsec-3.1.11’.
    Perhaps you need to add ‘parsec’ to the build-depends in your .cabal file.
    Use -v to see a list of the files searched for.

src/Folly/Lexer.hs:8:1: error:
    Failed to load interface for ‘Text.ParserCombinators.Parsec’
    It is a member of the hidden package ‘parsec-3.1.11’.
    Perhaps you need to add ‘parsec’ to the build-depends in your .cabal file.
    Use -v to see a list of the files searched for.
cabal: Leaving directory '/tmp/cabal-tmp-26093/Folly-0.1.4.2'
cabal: Error: some packages failed to install:
Folly-0.1.4.2 failed during the building phase. The exception was:
ExitFailure 1