I'm able to build, but not install, on a freshly-cloned HEAD, commit b84da617, from Simon PJ.
Installing library in
/Users/rae/local/stow/ghc-head/lib/ghc-7.7.20130403/haskell2010-1.1.1.0
"/Users/rae/local/stow/ghc-head/lib/ghc-7.7.20130403/bin/ghc-pkg" --force --global-package-db "/Users/rae/local/stow/ghc-head/lib/ghc-7.7.20130403/package.conf.d" update rts/package.conf.install
dyld: Library not loaded: @loader_path/../terminfo-0.3.2.5/libHSterminfo-0.3.2.5-ghc7.7.20130403.dylib
Referenced from: /Users/rae/local/stow/ghc-head/lib/ghc-7.7.20130403/bin/ghc-pkg
Reason: image not found
make[1]: *** [install_packages] Trace/BPT trap: 5
I'm on MacOS 10.7.5.