Previous commit has no problem except the name of the patch.
(wrong)   patch-Makefile
(correct) patch-Makefile.in
And the patch was really simple.

  But assuming to submit the fix to upstream (in case), the
patches should be made on Makefile.am first, and Makefile.in
should be generated by automake (and automake-1.11.1 in this
case).

This commit includes above changes, thanks.