IMHO, config.h is _way_ too generic a filename to be in the default ignore list.
=== modified file 'bzrlib/__init__.py'
--- bzrlib/__init__.py
+++ bzrlib/__init__.py
@@ -63,7 +63,6 @@
'_darcs',
'aclocal.m4',
'autom4te*',
- 'config.h',
'config.h.in',
'config.log',
'config.status',