subvertpy 0.8.8 fails to build on python 2.{4,5}

[jbergstroem]

Output below - similar on 2.4 and 2.5. Builds (and tests) fine on 2.6, 2.7.

running build_ext
building 'subvertpy.client' extension
creating build-2.5/temp.linux-x86_64-2.5
creating build-2.5/temp.linux-x86_64-2.5/subvertpy
x86_64-pc-linux-gnu-gcc -pthread -DNDEBUG -O2 -pipe -fno-strict-aliasing -fPIC -I/usr/include/apr-1 -I/usr/include/apr-1 -I/usr/include/subversion-1 -Isubvertpy -I/usr/include/python2.5 -c -I/usr/include/apr-1 -I/usr/include/apr-1 -I/usr/include/subversion-1 -Isubvertpy -I/usr/include/python2.5 -c subvertpy/client.c -o build-2.5/temp.linux-x86_64-2.5/subvertpy/client.o
subvertpy/client.c: In function ‘client_get_notify_func’:
subvertpy/client.c:326:5: warning: dereferencing ‘void *’ pointer
subvertpy/client.c:326:5: error: request for member ‘ob_refcnt’ in something not a structure or union
error: command 'x86_64-pc-linux-gnu-gcc' failed with exit status 1