Resolving dependencies...
cabal: Could not resolve dependencies:
trying: llvm-ffi-3.8.1:-buildexamples
trying: llvm-ffi-3.8.1:-llvm304
trying: llvm-ffi-3.8.1:-llvm305
trying: llvm-ffi-3.8.1:-llvm306
trying: llvm-ffi-3.8.1:-llvm307
rejecting: llvm-ffi-3.8.1:+specificpkgconfig (conflict: requires pkg-config
package llvm-3.8-any, not found in the pkg-config database)
rejecting: llvm-ffi-3.8.1:-specificpkgconfig (conflict: requires pkg-config
package llvm==3.8, not found in the pkg-config database)
Dependency tree exhaustively searched.