Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: llvm-ffi (dependency of llvm-tf-3.0.3.1.2)
rejecting: llvm-ffi-3.8.1, llvm-ffi-3.8.0, llvm-ffi-3.7.0, llvm-ffi-3.6.0,
llvm-ffi-3.5.1, llvm-ffi-3.5.0, llvm-ffi-3.4.0, llvm-ffi-3.3.0,
llvm-ffi-3.2.1, llvm-ffi-3.2.0, llvm-ffi-3.1.0 (conflict: llvm-tf =>
llvm-ffi==3.0.*)
trying: llvm-ffi-3.0.0.2
trying: llvm-ffi-3.0.0.2:-buildtools
rejecting: llvm-ffi-3.0.0.2:+specificpkgconfig (conflict: requires pkg-config
package llvm-3.0==3.0, not found in the pkg-config database)
rejecting: llvm-ffi-3.0.0.2:-specificpkgconfig (conflict: requires pkg-config
package llvm==3.0, not found in the pkg-config database)
Dependency tree exhaustively searched.