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bug#30431: 27.0.50; "Work even if libpng is install in /usr/local" cause

From: Paul Eggert
Subject: bug#30431: 27.0.50; "Work even if libpng is install in /usr/local" causes build failure
Date: Mon, 12 Feb 2018 11:42:30 -0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0

On 02/12/2018 11:13 AM, Glenn Morris wrote:
AFAICS, the issue is that the CHECK_MODULES method sets PNG_LIBS (and
PNG_CFLAGS), whereas the old method sets LIBPNG (and PNG_CFLAGS).

So revert the reversion, and then apply eg:

--- a/configure.ac
+++ b/configure.ac
@@ -3613,7 +3613,9 @@ elif test "${with_png}" != no; then
      AC_CHECK_HEADER([png.h], [HAVE_PNG=yes])
    elif test "${HAVE_X11}" = "yes" || test "${HAVE_W32}" = "yes"; then
     EMACS_CHECK_MODULES([PNG], [libpng >= 1.0.0])
-   if test $HAVE_PNG = no; then
+   if test $HAVE_PNG = yes; then
+   else
      # Test old way in case pkg-config doesn't have it (older machines).
      AC_MSG_CHECKING([for libpng not configured by pkg-config])

Thanks, Glenn. Werner, does that work for you?

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