The packaging, although using the 3.0 format, still uses patch/unpatch
logic in the debian/rules file because it is required to patch the
source to just make clean. Indeed, the upstream Makefile_s have a
clean target that does not work because of a call to rmdir.

Therefore, to build the package it is necessary to first apply the
build-system-fixes patch, then invoke the clean target and finally
unpatch the source so that it returns to its upstream pristine state.

 -- Filippo Rusconi <lopippo@debian.org>, Fri,  4 Apr 2014 13:35:41 +0200
