Hello, bug#10894 introduced a regression in commit 51f61dfb1e861062aaa1d73fab71278c85fe0594<http://git.savannah.gnu.org/cgit/automake.git/commit/?id=51f61dfb1e861062aaa1d73fab71278c85fe0594>
Formerly it was using the whole content of the *_SOURCES variable, which was causing problems with mixed C/vala projects, so you only grepped *.vala files from it. Fact is that not all vala files ends with the .vala extension, some of them end with the .vapi extension, and they are currently ignored. Attached patch fixes this issue I can also write & provide a test
0001-vala-allow-vapi-files-in-SOURCES.patch
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