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libpng issues


From: Werner LEMBERG
Subject: libpng issues
Date: Sat, 10 Feb 2018 20:46:59 +0100 (CET)

I've just been bitten by

  https://github.com/glennrp/libpng/issues/206

For this reason I suggest two improvements for the configure script of
emacs.

(1) Use `pkg-config' before `libpng-config' to detect libpng.

(2) If `libpng-config' is used, filter out `-L/usr/lib' and
    `-L/usr/lib64' (as suggested in issue #206).


    Werner



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