After moving to centos 6.5 I rebuilt gdb 7.6. It seemed ok but the python direcotry ( /usr/local/share/gdb/python/gdb ) was empty.
Checking the make install output showed it complained about missing makeinfo.
I installed the textinfo package, re-configured made and installed gdb and now the python directory is present.
Seems like an instance of the "missing makeinfo" build problem.
*** This bug has been marked as a duplicate of bug 14678 ***