Error compiling on SCO

I get the following error using either 7.1.3 or 7.2.b4

cc -b elf -G -Wl,-z,text -Wl,-h,libpq.so.2 fe-auth.o fe-connect.o fe-exec.o
fe-m
isc.o fe-print.o fe-lobj.o pqexpbuffer.o dllist.o md5.o
pqsignal.o     -lnsl -ls
ocket  -o libpq.so.2.2
relocations referenced
        from file(s)
        fe-connect.o
        fe-exec.o
        fe-misc.o
        fe-print.o
        fe-lobj.o
        dllist.o
 fatal error: relocations remain against allocatable but non-writable
section: .
text

make[3]: *** [libpq.so.2.2] Error 1

Help please