Error compiling 7.3.4 on Solaris 9

I am having problems compiling Postgres 7.3.4 on a Sun Fire V120
running Solaris 9.
./configure --with-java --with-openssl=/usr/local/ssl --enable-syslog --disable-shared --enable-locale --enable-multibyte
Configure goes OK, but when #gmake .... following error:

make[2]: Entering directory `~/src/postgresql-7.3.4/src/interfaces'
make[3]: Entering directory `~/src/postgresql-7.3.4/src/interfaces/libpq'
gcc -Wall -Wmissing-prototypes -Wmissing-declarations -fPIC -I. -I../../../src/include -I/usr/local/ssl/include -DFRONTEND -DSYSCONFDIR='"/usr/local/pgsql/etc"' -c -o fe-connect.o fe-connect.c
In file included from fe-connect.c:46:
/usr/include/crypt.h:22: parse error before `('
/usr/include/crypt.h:22: parse error before `const'
make[3]: *** [fe-connect.o] Error 1