Compiling for a.out

[Jon Lewis <jlewis@inorganic5.fdt.net>]

Anyone know what's going on here?

gcc -g -O -DHAVE_CONFIG_H -I.. -I../include  -o smtpserver smtpserver.o
version.o rfc821scn.o debugreport.o loadaver.o fdstatfs.o wantconn.o
-L../libs -lz -lzc
-lident -lmalloc_d
/users/misc/linux/src/libc-linux/posix/getopt.c(.data+0x4): multiple
definition
of `optind'
/usr/local/src/zmailer-2.99.38/libc/getopt.c(.data+0x0): first defined
here
/users/misc/linux/src/libc-linux/posix/getopt.c(.data+0x8): multiple
definition
of `opterr'
/usr/local/src/zmailer-2.99.38/libc/getopt.c(.data+0x4): first defined
here
/usr/lib/libg.sa(getopt.o): In function `getopt':
/users/misc/linux/src/libc-linux/posix/getopt.c:733: multiple definition
of `getopt'
../libs/libzc.a(getopt.o):/usr/local/src/zmailer-2.99.38/libc/getopt.c:51:
first defined here
make[1]: *** [smtpserver] Error 1
make[1]: Leaving directory `/usr/local/src/zmailer-2.99.38/smtpserver'
make: *** [all] Error 1

I'm trying to compile on an old Slackware 2.3 based box.

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