error

building path(s) ‘/nix/store/hmf7h4a4n3pfazil4s7xhmljz7ifv8d3-haskell-network-2.6.2.1’
setupCompilerEnvironmentPhase
Build with /nix/store/lab259kib5a9hfimxy3284imyhiw5z50-ghc-7.8.4.
unpacking sources
unpacking source archive /nix/store/3yq58312mv9l1mbzjv4wl74dq35fknm1-network-2.6.2.1.tar.gz
source root is network-2.6.2.1
patching sources
compileBuildDriverPhase
setupCompileFlags: -package-db=/private/var/folders/8w/n_txhbn945j9gxp6bz2nhkhr0000gn/T/nix-build-haskell-network-2.6.2.1.drv-0/package.conf.d -j8
[1 of 1] Compiling Main             ( Setup.hs, /private/var/folders/8w/n_txhbn945j9gxp6bz2nhkhr0000gn/T/nix-build-haskell-network-2.6.2.1.drv-0/Main.o )
Linking Setup ...
configuring
configureFlags: --verbose --prefix=/nix/store/hmf7h4a4n3pfazil4s7xhmljz7ifv8d3-haskell-network-2.6.2.1 --libdir=$prefix/lib/$compiler --libsubdir=$pkgid --with-gcc=clang --package-db=/private/var/folders/8w/n_txhbn945j9gxp6bz2nhkhr0000gn/T/nix-build-haskell-network-2.6.2.1.drv-0/package.conf.d --ghc-option=-optl=-Wl,-headerpad_max_install_names --disable-split-objs --disable-library-profiling --enable-shared --enable-library-vanilla --enable-executable-dynamic --enable-tests
Configuring network-2.6.2.1...
Dependency HUnit -any: using HUnit-1.2.5.2
Dependency base >=3 && <5: using base-4.7.0.2
Dependency bytestring <0.11: using bytestring-0.10.4.0
Dependency network -any: using network-2.6.2.1
Dependency test-framework -any: using test-framework-0.8.1.1
Dependency test-framework-hunit -any: using test-framework-hunit-0.3.0.1
Dependency unix >=2: using unix-2.7.0.1
Setup: The following installed packages are broken because other packages they
depend on are missing. These broken packages must be rebuilt before they can
be used.
package ansi-terminal-0.6.2.1 is broken due to missing package
base-4.7.0.2-99f2b20e2491b27225d4c673401d826f,
unix-2.7.0.1-1e65c8c07a296a114e84d60c2f18351a
package mtl-2.1.3.1 is broken due to missing package
base-4.7.0.2-99f2b20e2491b27225d4c673401d826f
package test-framework-0.8.1.1 is broken due to missing package
random-1.1-822c19b7507b6ac1aaa4c66731e775ae
package xml-1.3.14 is broken due to missing package
text-1.2.1.1-8ef0a2f3c6eb30c72fb494410dc2efe1
builder for ‘/nix/store/k438imaq7r7gbqrcl4p1drwk5axami4h-haskell-network-2.6.2.1.drv’ failed with exit code 1
cannot build derivation ‘/nix/store/xzwiqrdhpjdl0afp18i9b3bgffc5db98-cabal-install-1.22.6.0.drv’: 1 dependencies couldn't be built
building path(s) ‘/nix/store/cwrii1qfwg0603nxqp67a134ag0hd3bj-python2.7-gevent-1.0.2’
killing process 43650
cannot build derivation ‘/nix/store/sx3b25p9y5j9jwbrhw0n6lidachi1vhx-ghc-7.8.4.drv’: 1 dependencies couldn't be built