$OpenBSD: patch-configure_ac,v 1.2 2010/09/16 07:52:54 sthen Exp $
--- configure.ac.orig	Sat Jul 24 22:16:56 2010
+++ configure.ac	Sat Sep  4 21:28:47 2010
@@ -45,6 +45,11 @@ case "${host_os}" in
 		;;
 	esac
 	;;
+  openbsd*)
+    PANO_WIN32_RESOURCE=
+    HSYS=openbsd
+    HCPU="${target_cpu}"
+    ;;
   *darwin*)
     PANO_WIN32_RESOURCE=
     HSYS=darwin
@@ -79,6 +84,7 @@ esac
 AM_CONDITIONAL(HAVE_DARWIN, test "${HSYS}" = "darwin")
 AM_CONDITIONAL(HAVE_SOLARIS, test "${HSYS}" = "solaris")
 AM_CONDITIONAL(HAVE_LINUX, test "${HSYS}" = "linux")
+AM_CONDITIONAL(HAVE_OPENBSD, test "${HSYS}" = "openbsd")
 AM_CONDITIONAL(HAVE_MAC, test "${HSYS}" = "classic")
 AM_CONDITIONAL(HAVE_MINGW, test "${HSYS}" = "mingw32")
 AM_CONDITIONAL(HAVE_CYGWIN, test "${HSYS}" = "cygwin")
@@ -102,7 +108,7 @@ if test "x$have_zlib" != xyes; then
     ])
 fi
 
-AX_CHECK_PNG
+PKG_CHECK_MODULES(PNG, libpng, have_png=yes, have_png=no)
 if test "x$have_png" != xyes; then
     AC_MSG_ERROR([
         the png library must be installed on your system
@@ -183,8 +189,8 @@ echo "  CXX            = $CXX"
 echo "  CXXFLAGS       = $CXXFLAGS"
 echo "  JPEG_FLAGS     = $JPEG_FLAGS"
 echo "  LIB_JPEG       = $LIB_JPEG"
-echo "  PNG_FLAGS      = $PNG_FLAGS"
-echo "  LIB_PNG        = $LIB_PNG"
+echo "  PNG_FLAGS      = $PNG_CFLAGS"
+echo "  LIB_PNG        = $PNG_LIBS"
 echo "  TIFF_FLAGS     = $TIFF_FLAGS"
 echo "  LIB_TIFF       = $LIB_TIFF"
 echo "  ZLIB_FLAGS     = $ZLIB_FLAGS"