*** setup configure

Configuring nano-hmac-0.2.0...
Flags chosen: split-base=True
Dependency base >=3: using base-4.3.0.0
Dependency bytestring -any: using bytestring-0.9.1.8
Using Cabal-1.10.0.0 compiled by ghc-7.0
Using compiler: ghc-7.0.1
Using install prefix: /usr/local/tmp/archive/install
Binaries installed in: /usr/local/tmp/archive/install/bin
Libraries installed in:
/usr/local/tmp/archive/install/lib/nano-hmac-0.2.0/ghc-7.0.1
Private binaries installed in: /usr/local/tmp/archive/install/libexec
Data files installed in: /usr/local/tmp/archive/install/share/nano-hmac-0.2.0
Documentation installed in:
/usr/local/tmp/archive/install/share/doc/nano-hmac-0.2.0
Using alex version 2.3.3 found on system at: /usr/bin/alex
Using ar found on system at: /usr/bin/ar
Using c2hs version 0.16.0 found on system at: /usr/local/bin/c2hs
Using cpphs version 1.11 found on system at: /usr/local/bin/cpphs
Using ffihugs found on system at: /usr/local/bin/ffihugs
Using gcc version 4.4.5 found on system at: /usr/bin/gcc
Using ghc version 7.0.1 found on system at: /usr/local/bin/ghc
Using ghc-pkg version 7.0.1 found on system at: /usr/local/bin/ghc-pkg
Using greencard found on system at:
/usr/local/tmp/archive/install/bin/greencard
Using haddock version 2.8.0 found on system at: /usr/local/bin/haddock
Using happy version 1.18.6 found on system at: /usr/local/bin/happy
No hmake found
Using hsc2hs version 0.67 found on system at: /usr/local/bin/hsc2hs
Using hscolour version 1.17 found on system at: /usr/local/bin/HsColour
Using hugs found on system at: /usr/local/bin/hugs
No jhc found
Using ld found on system at: /usr/bin/ld
No lhc found
No lhc-pkg found
No nhc98 found
Using pkg-config version 0.25 found on system at: /usr/bin/pkg-config
Using ranlib found on system at: /usr/bin/ranlib
Using strip found on system at: /usr/bin/strip
Using tar found on system at: /bin/tar
No uhc found

*** setup build

Creating dist/build (and its parents)
Creating dist/build/autogen (and its parents)
Preprocessing library nano-hmac-0.2.0...
Building nano-hmac-0.2.0...
Building library...
Creating dist/build (and its parents)
/usr/local/bin/ghc --make -package-name nano-hmac-0.2.0 -hide-all-packages -fbuilding-cabal-package -i -idist/build -i. -idist/build/autogen -Idist/build/autogen -Idist/build -optP-include -optPdist/build/autogen/cabal_macros.h -odir dist/build -hidir dist/build -stubdir dist/build -package-id base-4.3.0.0-b91367e4fa5bd47d8e75958171ad21b7 -package-id bytestring-0.9.1.8-2e812324817b74c7c5038e2cb74d96a9 -O -Wall -Werror -O2 -fvia-C -XHaskell98 -XForeignFunctionInterface -XBangPatterns -XCPP Data.Digest.OpenSSL.HMAC

on the commandline:
    Warning: The -fvia-C flag will be removed in a future GHC release

<no location info>: 
Failing due to -Werror.