pkg.m4 needs a serial so that other projects can distribute it but still use the installed version if the installed version is newer. (See http://www.gnu.org/software/hello/manual/automake/Serials.html) Patch coming.
Created attachment 27570 [details] [review] Add a serial line I made a guess at what the next version of pkg-config is going to be, obviously it should be changed if I'm wrong. :)
Fixed in e907f2a. Thanks for the bug.
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