Hi there. I am trying to get an unregisterised build of ghc 7.0.2 working and am having problems turning mangling off. When I build the compiler with GhcUnregisterized = YES GhcWithNativeCodeGen = NO SplitObjs = NO BeConservative = YES The 'evil mangler' is still used. When I disable it at the command line with -fno-asm-mangling the FB_ macro is still put into the generated C. I just want to turn everything related to this dreaded "evil mangler" off, and still produce working executables. Are there things that I could set in the build.mk file to do this, or is it more involved? I have read some things in the mailing list and the bug tracker that (to my ignorant and slightly confused ears) seem to suggest that this unregisterised is problematic or depreciated or something. If this is the case I would be perfectly happy using an older version of the compiler, and would be grateful if someone could point me to a specific older version number where this stuff builds with less hassel. I don't care how out of date it is. In case you are wondering, I am attempting to get an unregisterised port of ghc working in plan9, an operating system that has yet to be blessed with a haskell implementation (hugs doesn't count :P) Plan 9 has a gcc port, an older one, but it should be fine.