Resolving dependencies...
Configuring transformers-compat-0.5.1.4...
Configuring mtl-2.2.1...
Building transformers-compat-0.5.1.4...
Building mtl-2.2.1...
Configuring text-1.2.2.1...
Installed transformers-compat-0.5.1.4
Building text-1.2.2.1...
Configuring utf8-string-1.0.1.1...
Installed mtl-2.2.1
Building utf8-string-1.0.1.1...
Installed utf8-string-1.0.1.1
Installed text-1.2.2.1
Configuring parsec-3.1.11...
Building parsec-3.1.11...
Installed parsec-3.1.11
Configuring llvm-hs-pure-4.0.0.0...
Building llvm-hs-pure-4.0.0.0...
Installed llvm-hs-pure-4.0.0.0
Configuring llvm-hs-4.0.1.0...
Failed to install llvm-hs-4.0.1.0
Build log ( /home/builder/.cabal/logs/llvm-hs-4.0.1.0.log ):
cabal: Entering directory '/tmp/cabal-tmp-7492/llvm-hs-4.0.1.0'
[1 of 1] Compiling Main             ( /tmp/cabal-tmp-7492/llvm-hs-4.0.1.0/dist/setup/setup.hs, /tmp/cabal-tmp-7492/llvm-hs-4.0.1.0/dist/setup/Main.o )
Linking /tmp/cabal-tmp-7492/llvm-hs-4.0.1.0/dist/setup/setup ...
setup: The program 'llvm-config' version ==4.0.* is required but the version
found at /usr/bin/llvm-config is version 3.4
cabal: Leaving directory '/tmp/cabal-tmp-7492/llvm-hs-4.0.1.0'
cabal: Error: some packages failed to install:
llvm-hs-4.0.1.0 failed during the configure step. The exception was:
ExitFailure 1