$NetBSD: patch-configure,v 1.1 2022/07/27 18:56:43 wiz Exp $

Fix png library name.

--- configure.orig	2010-10-09 06:19:22.000000000 +0000
+++ configure
@@ -4695,13 +4695,13 @@ echo "$as_me: error: zlib.h header not f
 fi
 
 
-{ echo "$as_me:$LINENO: checking for main in -lpng" >&5
-echo $ECHO_N "checking for main in -lpng... $ECHO_C" >&6; }
+{ echo "$as_me:$LINENO: checking for main in -lpng16" >&5
+echo $ECHO_N "checking for main in -lpng16... $ECHO_C" >&6; }
 if test "${ac_cv_lib_png_main+set}" = set; then
   echo $ECHO_N "(cached) $ECHO_C" >&6
 else
   ac_check_lib_save_LIBS=$LIBS
-LIBS="-lpng  $LIBS"
+LIBS="-lpng16  $LIBS"
 cat >conftest.$ac_ext <<_ACEOF
 /* confdefs.h.  */
 _ACEOF
@@ -4751,7 +4751,7 @@ fi
 { echo "$as_me:$LINENO: result: $ac_cv_lib_png_main" >&5
 echo "${ECHO_T}$ac_cv_lib_png_main" >&6; }
 if test $ac_cv_lib_png_main = yes; then
-  LIBPNG="yes"; LIBS="-lpng ${LIBS}"
+  LIBPNG="yes"; LIBS="-lpng16 ${LIBS}"
 else
   LIBPNG="no"
 fi