Cannot compile psql

I just tried recompiling the latest source for the first time in weeks, but
it appears I cannot compile pgsql. My source should be up-to-date since I
use cvsup everytime I go online. But during compile I get:

gcc -I../../interfaces/libpq -I../../include -I../../backend   -O2 -Wall -Wmissing-prototypes   -c -o common.o
common.c
In file included from ../../include/postgres.h:41,                from ../../interfaces/libpq/pqsignal.h:20,
   from common.c:23:
 
../../include/utils/mcxt.h:25: syntax error before `MemoryContext'
make[2]: *** [common.o] Error 1

Is this a problem on my site? 

Michael 
-- 
Michael Meskes                         | Go SF 49ers!
Th.-Heuss-Str. 61, D-41812 Erkelenz    | Go Rhein Fire!
Tel.: (+49) 2431/72651                 | Use Debian GNU/Linux!
Email: Michael@Fam-Meskes.De           | Use PostgreSQL!