I have a RedHat 3 ES built system. I am trying to install Qmail 1.03. I downloaded the source, and installed it using the rpm-ivh command, and then attempted to use rpmbuild --rebuild on the installed src. It makes it a significant way through, but fails with :

./compile auto-str.c
auto-str.c: In function `main':
auto-str.c:17: warning: return type of `main' is not `int'
./load auto-str substdio.a error.a str.a
substdio.a(substdo.o)(.text+0x43): In function `allwrite':
: undefined reference to `errno'
collect2: ld returned 1 exit status
make: *** [auto-str] Error 1
error: Bad exit status from /var/tmp/rpm-tmp.40955 (%build)


RPM build errors:
Bad exit status from /var/tmp/rpm-tmp.40955 (%build)

Is there some one that that can point me to installation instructions that will work with a RedHat 3 ES system?