Hello, I'm trying to build ghc-7.8 branch under Fedora 21 and I get the failure diagnostics appended below. The problem seems to be that the build process cannot satisfy deepseq >=1.2 && <1.4, but I explicitly installed deepseq-1.3.0.2, and this did not help (same error?). Under Fedora 21 Haskell Platform contains ghc-7.6.3, so this is the boot compiler. The ghc binary for centos65 installs provided I define /usr/lib64/libgmp.so.3 as a symbolic link to /usr/lib64/libgmp.so.10, a risky move. Any tips would be much appreciated. Thanks, Dominick ===--- building phase 0 make -r --no-print-directory -f ghc.mk phase=0 phase_0_builds make[1]: Nothing to be done for 'phase_0_builds'. ===--- building phase 1 make -r --no-print-directory -f ghc.mk phase=1 phase_1_builds "inplace/bin/ghc-cabal" check libraries/containers 'ghc-options: -O2' is rarely needed. Check that it is giving a real benefit and not just imposing longer compile times on your users. "inplace/bin/ghc-cabal" configure libraries/containers dist-install "" --with-ghc="/home/dsamperi/install/git/ghc/inplace/bin/ghc-stage1" --with-ghc-pkg="/home/dsamperi/install/git/ghc/inplace/bin/ghc-pkg" --disable-library-for-ghci --enable-library-vanilla --disable-library-profiling --enable-shared --configure-option=CFLAGS=" -fno-stack-protector " --configure-option=LDFLAGS=" " --configure-option=CPPFLAGS=" " --gcc-options=" -fno-stack-protector " --with-gcc="/usr/bin/gcc" --with-ld="/usr/bin/ld" --configure-option=--with-cc="/usr/bin/gcc" --with-ar="/usr/bin/ar" --with-ranlib="/usr/bin/ranlib" --with-alex="/home/dsamperi/.cabal/bin/alex" --with-happy="/home/dsamperi/.cabal/bin/happy" Configuring containers-0.5.5.1... ghc-cabal: At least the following dependencies are missing: deepseq >=1.2 && <1.4 libraries/containers/ghc.mk:4: recipe for target 'libraries/containers/dist-install/package-data.mk' failed make[1]: *** [libraries/containers/dist-install/package-data.mk] Error 1 Makefile:71: recipe for target 'all' failed make: *** [all] Error 2