7.1.3 fails to configure on Solaris 2.7

postgres 7.1.3
Solaris 2.7, 64-bit
gcc 2.95.3 from sunfreeware.com
gmake 3.79.1 (named gmake so it doesn't conflict with /usr/ccs/bin/make)
tcl&tk 8.3.4
readline 4.2a
openssl 0.9.6b
perl 5.6.1 available in AFS space
openafs, gzip, zlib, rsync, and rdist also installed but shouldn't matter
PATH is:
/usr/ccs/bin:/usr/local/bin:/usr/ucb:/bin:/usr/bin:/usr/sbin:/usr/dt/bin:/usr/openwin/bin:/usr/afsws/bin:/usr/ets/bin
(last two are via AFS)
ln -s /usr/local/bin/gcc /usr/ucb/cc

./configure [no options whatever]
...
checking for optreset... no
checking test program... failed

tail config.log
...
configure:6806: gcc -o conftest conftest.c -lz -lresolv -lgen -lnsl
-lsocket -ldl -lm -lreadline -ltermcap 1>&5
configure: failed program was:
#line 6802 "configure"
#include "confdefs.h"
int main() { return 0; }

I can put those 3 lines in a file and use those gcc options and it
compiles just fine thank you. All of the above typed by hand.
Caveats.
--
The opinions expressed in this message are mine,
not those of Caltech, JPL, NASA, or the US Government.
Henry(dot)B(dot)Hotz(at)jpl(dot)nasa(dot)gov, or hbhotz(at)oxy(dot)edu