compilation fail

Output from cimpilation:

gmake -C lib all
gmake[2]: Entering directory `/usr/ports/databases/postgresql/work/src/backend/lib'
cc -I../../include -I../../backend -I/usr/local/include -O -pipe -I.. -c -o stringinfo.o stringinfo.c
stringinfo.c: In function `appendStringInfo':
stringinfo.c:104: `va_list' undeclared (first use this function)
stringinfo.c:104: (Each undeclared identifier is reported only once
stringinfo.c:104: for each function it appears in.)
stringinfo.c:104: parse error before `args'
stringinfo.c:121: `args' undeclared (first use this function)
gmake[2]: *** [stringinfo.o] Error 1
gmake[2]: Leaving directory `/usr/ports/databases/postgresql/work/src/backend/lib'
gmake[1]: *** [lib.dir] Error 2
gmake[1]: Leaving directory `/usr/ports/databases/postgresql/work/src/backend'
gmake: *** [all] Error 2
su-2.03#

My envoirments:
FreeBSD 3.4 release
gmake 3.78
Postgresql-7.0.3

Thanks for help
Marek