[mod_python] warning: "_POSIX_C_SOURCE" redefined - is this a significant problem?

Environment:

RedHat Linux Enterprise 3

 > gcc -v
Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/3.2.3/specs
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man  
--infodir=/usr/share/info --enable-shared --enable-threads=posix  
--disable-checking --with-system-zlib --enable-__cxa_atexit  
--host=i386-redhat-linux
Thread model: posix
gcc version 3.2.3 20030502 (Red Hat Linux 3.2.3-42)


I build Apache httpd, Python and then mod_python, and I get

  warning: "_POSIX_C_SOURCE" redefined

Here's the build scenario with reported errors. Can anyone comment on  
the significance of this?

# =========== make clean
rm -rf /tmp/httpd-2.0.52 /tmp/python

# =========== make httpd
cd ~/src
rm -rf httpd-2.0.52
tar zxvf ~/downloads/httpd-2.0.52.tar.gz
cd httpd-2.0.52
./configure --prefix=/tmp/httpd-2.0.52 \
     --enable-mods-shared=most \
     --enable-so

make
sudo make install

# =========== make Python
cd ~/src
rm -rf Python-2.3.4
tar zxvf ~/downloads/Python-2.3.4.tgz
cd Python-2.3.4
./configure --prefix=/tmp/python --enable-shared
make
make test
sudo make install

# ========== update environment
sudo chown -R auser: /tmp/httpd-2.0.52 /tmp/python
export  
LD_LIBRARY_PATH=/tmp/httpd-2.0.52/lib:/tmp/python-2.3.4/ 
lib:$LD_LIBRARY_PATH

# ========== make mod_python
cd ~/src
rm -rf mod_python-3.1.3
tar zxvf ~/downloads/mod_python-3.1.3.tgz
cd mod_python-3.1.3
./configure --with-apxs=/tmp/httpd-2.0.52/bin/apxs  
--with-python=/tmp/python/bin/python2.3
make

make[1]: Entering directory `/data/home/auser/src/mod_python-3.1.3/src'

Compiling for DSO.

/tmp/httpd-2.0.52/bin/apxs  
-I/home/auser/src/mod_python-3.1.3/src/include  
-I/tmp/httpd-2.0.52/include -I/tmp/python/include/python2.3 -c  
mod_python.c _apachemodule.c requestobject.c tableobject.c util.c  
serverobject.c connobject.c filterobject.c hlist.c hlistobject.c  
-L/tmp/python/lib/python2.3/config  -Xlinker -export-dynamic      -lm   
-lpython2.3 -lpthread -ldl -lutil -lm
/tmp/httpd-2.0.52/build/libtool --silent --mode=compile gcc -prefer-pic  
  -DAP_HAVE_DESIGNATED_INITIALIZER -DLINUX=2 -D_REENTRANT  
-D_XOPEN_SOURCE=500 -D_BSD_SOURCE -D_SVID_SOURCE -D_GNU_SOURCE -g -O2  
-pthread -I/tmp/httpd-2.0.52/include  -I/tmp/httpd-2.0.52/include    
-I/tmp/httpd-2.0.52/include   
-I/home/auser/src/mod_python-3.1.3/src/include  
-I/tmp/httpd-2.0.52/include -I/tmp/python/include/python2.3  -c -o  
mod_python.lo mod_python.c && touch mod_python.slo
In file included from /tmp/python/include/python2.3/Python.h:8,
                  from  
/home/auser/src/mod_python-3.1.3/src/include/mod_python.h:57,
                  from mod_python.c:28:
/tmp/python/include/python2.3/pyconfig.h:850:1: warning:  
"_POSIX_C_SOURCE" redefined
In file included from /usr/include/sys/types.h:27,
                  from /tmp/httpd-2.0.52/include/apr.h:112,
                  from /tmp/httpd-2.0.52/include/ap_config.h:19,
                  from /tmp/httpd-2.0.52/include/httpd.h:29,
                  from  
/home/auser/src/mod_python-3.1.3/src/include/mod_python.h:32,
                  from mod_python.c:28:
/usr/include/features.h:131:1: warning: this is the location of the  
previous definition
/tmp/httpd-2.0.52/build/libtool --silent --mode=compile gcc -prefer-pic  
  -DAP_HAVE_DESIGNATED_INITIALIZER -DLINUX=2 -D_REENTRANT  
-D_XOPEN_SOURCE=500 -D_BSD_SOURCE -D_SVID_SOURCE -D_GNU_SOURCE -g -O2  
-pthread -I/tmp/httpd-2.0.52/include  -I/tmp/httpd-2.0.52/include    
-I/tmp/httpd-2.0.52/include   
-I/home/auser/src/mod_python-3.1.3/src/include  
-I/tmp/httpd-2.0.52/include -I/tmp/python/include/python2.3  -c -o  
_apachemodule.lo _apachemodule.c && touch _apachemodule.slo
In file included from /tmp/python/include/python2.3/Python.h:8,
                  from  
/home/auser/src/mod_python-3.1.3/src/include/mod_python.h:57,
                  from _apachemodule.c:25:
/tmp/python/include/python2.3/pyconfig.h:850:1: warning:  
"_POSIX_C_SOURCE" redefined
In file included from /usr/include/sys/types.h:27,
                  from /tmp/httpd-2.0.52/include/apr.h:112,
                  from /tmp/httpd-2.0.52/include/ap_config.h:19,
                  from /tmp/httpd-2.0.52/include/httpd.h:29,
                  from  
/home/auser/src/mod_python-3.1.3/src/include/mod_python.h:32,
                  from _apachemodule.c:25:
/usr/include/features.h:131:1: warning: this is the location of the  
previous definition
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