I have managed to get both static and dynamic to work on Ubuntu; and I've set aside a repo on Github to collect notes on this stuff as I work out building on various systems. https://github.com/solidsnack/hso I need rpath for the dynamic-dynamic case on Ubuntu: ghc -shared -dynamic -o libfoo.dynamic-dynamic.so \ Foo.o Foo_stub.o fooinit.o \ -L/usr/lib/ghc-6.12.1 \ -optl-Wl,-rpath,/usr/lib/ghc-6.12.1 \ -lHSrts-ghc6.12.1 The linker options in both cases could be derived automagically from ghc-pkg, I think. I've set aside dynamic-static for now (not sure what use it would be). It turns out there is a simpler way to write Foo_init: extern void __stginit_Foo(void); static void Foo_init (void) __attribute__ ((constructor)); void Foo_init (void) { int argc = 1; char *arg = ""; char **argv = &arg; hs_init(&argc, &argv); hs_add_root(__stginit_Foo); } Is there any case in which the empty string would be unsafe? -- Jason Dusek () ascii ribbon campaign - against html e-mail /\ www.asciiribbon.org - against proprietary attachments