This was found originally when trying to use automake-1.13 (including attempt with 1.13.3) for gtk-engines-2.20.2, but I've tried to produce minimum Makefile.am to reproduce the problem (attached).
When variable TESTS gets assigned result from patsubst -function, running make for resulting Makefile errors with: Makefile:592: *** unterminated variable reference. Stop. Attached testcase includes minimum configure.ac and Makefile.am and separate ./run.sh script to produce rest of the files and to run make. - ML
automakeTESTSbug.tar.xz
Description: Binary data
