Cannot compile psql - Mailing list pgsql-hackers

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 
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