Checks for libev mimicking pkg-config’s way of doing things for as long as upstream doesn’t provide a .pc file. If successful and provided expand ACTION-IF-FOUND, otherwise expand ACTION-IF-NOT-FOUND, or, if omitted, error out like pkg-config does.
Defines libev_LIBS and libev_CFLAGS.
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Copyright © 2012 Sebastian Freundt email@example.com
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