error building python24 on mac os x

[Stuart Robertson]

I want to install either rdiff or unison or duplicity in order to  
have incremental off-site backups. Each of these ports fails when  
python24 fails to build with the following error message at the mac  
os x command line:

Warning: the following items did not execute (for python24):  
com.apple.activate com.apple.build com.apple.destroot com.apple.install
Error: The following dependencies failed to build: python24
Error: Status 1 encountered during processing.

Above this message are approx. 220 lines which mostly include 'Python/ 
mactoolboxglue.c:456: warning: return makes integer from pointer  
without a cast'. I'm guessing that the problem is something to do  
with the commands used when trying to build python24 but I've too  
little understanding of unix, the command line, python and compilers  
to make sense of the appropriate lines. The first two lines of output  
concerning python are:

--->  Building python24 with target all
/usr/bin/gcc-4.0 -c -fno-strict-aliasing -Wno-long-double -no-cpp- 
precomp -mno-fused-madd -fno-common -fno-common -dynamic -DNDEBUG -g - 
O3 -Wall -Wstrict-prototypes -I/opt/local/include -I. -I./Include  - 
DPy_BUILD_CORE -o Python/mactoolboxglue.o Python/mactoolboxglue.c

I've googled to no avail and consulted the list archives for a solution.

Any help appreciated,

Stuart

Imac G5
mac os x 10.4.9
xcode 2.4.1