tatsuhiro-t/aria2 — pull request #54 by nmaier (2013-03-02 14:12:33+00:00)
Title: Check for sys/signal.h and/or signal.h (Take 2)

mingw-w64 does not actually have sys/signal.h, while OSX currently has a
broken signal.h
Better check the presence of both and use sys/signal.h if present, else
signal.h