bison -p php -v -d ./language-parser.y -o language-parser.tab.c
gcc -O2   -I. -I.   -I/usr2/WWWstuff/apache_1.3b5/src/include -I/usr2/WWWstuff/apache_1.3b5/src/os/unix         -I/usr/local/pgsql/include   -g -Wall     -c language-parser.tab.c -o language-parser.tab.o
In file included from /usr2/WWWstuff/apache_1.3b5/src/include/httpd.h:66,
                 from parser.h:167,
                 from ./language-parser.y:51:
/usr2/WWWstuff/apache_1.3b5/src/include/ap.h:64: conflicting types for `vsnprintf'
/usr/local/lib/gcc-lib/i686-pc-solaris2.6/egcs-2.90.27/include/stdio.h:270: previous declaration of `vsnprintf'
make: *** [language-parser.tab.o] Error 1

gcc version egcs-2.90.27 980315 (egcs-1.0.2 release)
Building apache module for Apache 1.3
Postgres 6.3.2