linking with c++ libraries

I'm trying to use from Haskell a C++ library (Omega Calculator). I'm using the following command: ghc -c -fglasgow-exts -package lang main.hs ghc main.o mylib.o -lomega -lstdc++ -fglasgow-exts -package lang Do I need to add more options? The compilation went fine (after I added -lstdc++ which is invoked by default by "g++", but not by "ghc"), but the executable generates a core. Omega library used from a C++ file, with the same call, and same parameters runs ok. Best regards, Corneliu