Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] trying: llvm-tf-3.1.1.1 (user goal)
[__1] trying: llvm-ffi-3.8.1 (dependency of llvm-tf)
[__2] trying: llvm-ffi:-llvm304
[__3] trying: llvm-ffi:-llvm305
[__4] trying: llvm-ffi:-llvm306
[__5] trying: llvm-ffi:-llvm307
[__6] rejecting: llvm-ffi:+specificpkgconfig (conflict: pkg-config package
llvm-3.8-any, not found in the pkg-config database)
[__6] rejecting: llvm-ffi:-specificpkgconfig (conflict: pkg-config package
llvm==3.8, not found in the pkg-config database)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: llvm-tf, llvm-ffi,
llvm-ffi:specificpkgconfig, llvm-ffi:llvm304, llvm-ffi:llvm305,
llvm-ffi:llvm306, llvm-ffi:llvm307