If a project has a single Makefile.am referrencing C and Vala projects, distcheck currenly fails telling there are no source files for generating stamps for C-only binaries. Attached patch avoid dealing with vala stuff for binaries not related to vala insice C/Vala mixed project + adds a test for it
0001-vala-fix-distcheck-with-c-vala-mixed-projects.patch
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