help !

I have meet a problem during complie under the sco unix 5.05 udk .the information show below:

cc -o stcom stcom.o stlib.o catchsin.o getlsd.o -L../../lib/sco -Ishm -Iipc -Isocket -Im
UX: Id :WNRNIGN:../../lib/sco/libshm.a(libshm.o):notice:internal conversion of COFF to ELF
UX:Id :ERROR:../../lib/sco/libshm.a(libshm.o): fatal error: cannot link openserver object inot iABI targer
*** ERROR code 1 (bu21)
UX:make :ERROR:fatal error

because it can be complied under the sco .3.0 5 ,
how can I deel with them ,help ,thank you .