Trying to build 7.0.3 on SCO 5.0.4

I am running with configure --with-perl
make clean
make

cc -b elf -o ecpg preproc.o pgc.o type.o ecpg.o ecpg_keywords.o output.o
keywords.o c_keywords.o ../lib/typename.o descriptor.o variable.o  -lPW
-lgen -lcrypt -lld -lnsl -lsocket -ldl -lm -ltermcap -lcurses  -W l,-Bexport
Undefined                       first referenced
  symbol                             in file
nocachegetattr                      pgc.o
ecpg: fatal error: Symbol referencing errors. No output written to ecpg
make[3]: *** [ecpg] Error 1
make[3]: Leaving directory
`/tmp/postgresql-7.0.3/src/interfaces/ecpg/preproc'
make[2]: *** [all] Error 2
make[2]: Leaving directory `/tmp/postgresql-7.0.3/src/interfaces/ecpg'
make[1]: *** [all] Error 2
make[1]: Leaving directory `/tmp/postgresql-7.0.3/src/interfaces'
make: *** [all] Error 2