compile warnings

In addition to the ecpg warnings mentioned by Tom, I'm also seeing
compile warnings wrt plpython:

make[3]: Entering directory `/opt/src/pgsql-cvs/pgsql-7.5/src/pl/plpython'
gcc -O2 -fno-strict-aliasing -g -Wall -Wmissing-prototypes
-Wmissing-declarations -fpic -I. -I/usr/include/python2.3
-I../../../src/include -D_GNU_SOURCE -I/usr/include/et -c -o
plpython.o plpython.c -MMD
In file included from /usr/include/python2.3/Python.h:8,
from plpython.c:58:
/usr/include/python2.3/pyconfig.h:847:1: warning: "_POSIX_C_SOURCE"
redefined
In file included from /usr/include/stdio.h:28,
from ../../../src/include/c.h:60,
from ../../../src/include/postgres.h:48,
from plpython.c:37:
/usr/include/features.h:131:1: warning: this is the location of the
previous definition
ar crs libplpython.a plpython.o

Joe