Got tinyfugue 50b8 to compile on Leopard tonight; one line was all that was needed. Out of the box the compilation failure is:

malloc.c:15: error: syntax error before 'mmalloc_base'
malloc.c:15: warning: initialization makes integer from
pointer without a cast
malloc.c:15: warning: data definition has no type or storage
class
make[1]: *** [malloc.o] Error 1
make: *** [files] Error 2

Add this at line 13:

#include <sys/types.h>

and it should compile. I tested it against my local MOO and it worked fine.