Compilation on Darwin/MacOSX

[Alexander Diemand]

Dear All

I am trying to compile some prolog programs on a Mac running Darwin/OSX(10.3).
GNU Prolog version: 1.2.16
GCC 3.3 (Apple's version)

While examples in GNU Prolog work fine, programs with native interface to 
other libraries fail. 
Example:

ld: obj-Darwin/pgsql.pl.o has external relocation entries in non-writable 
section (__TEXT,__text) for symbols:
_strdup

The symbol "_strdup" is defined in libc but the linker cannot find it (??!!).

Has someone already successfully compiled prolog code under Darwin/MacOSX? 
Do I miss some compiler/linker flags?

Thanks for your hints

Alex.