Ok, I have made a "ghc -v"and see the problem :

* on OS X, a SDL program must have a main function supplied by a lib : libSDLmain.a * This is achieved by adding -lSDLmain at the command line.

* libHSrts.a supply a main. My program is linked against this lib by a -lHSrts.

ld is called by ghc with args : [...] lHSrts [...] -lSDLmain [...]

Hmm, I just checked the source, and GHC definitely calls the linker passing any -l options from the command line *before* -l options from packages (-lHSrts comes from the rts package). And I just tried a small example with -lfoo on the command line, and it does indeed come before -lHSrts. So could you post *exactly* what you're doing, the full command lines and the full output from ghc -v so we can see what's going wrong. Cheers, SImon