pim-manager-api.txt is not part of source code distribution. Must add it to EXTRA_DIST.
Author: Patrick Ohly <email@example.com>
Date: Wed May 29 09:32:34 2013 +0200
PIM: include pim-manager-api.txt in source distro (FDO #62516)
The text file must be listed explicitly to be included by "make dist".