--- configure.in.org	2015-07-07 18:11:23.096956530 +0700
+++ configure.in	2015-07-07 19:48:56.762919821 +0700
@@ -34,18 +34,22 @@
 
 pkg_modules="gtk+-2.0 >= 2.6.0"
 PKG_CHECK_MODULES(PACKAGE, [$pkg_modules])
-AC_SUBST(PACKAGE_CFLAGS)
-AC_SUBST(PACKAGE_LIBS)
+dnl AC_SUBST(PACKAGE_CFLAGS)
+dnl AC_SUBST(PACKAGE_LIBS)
 
 gimp_modules="gimp-2.0 >= 2.0.0"
 PKG_CHECK_MODULES(GIMP, [$gimp_modules])
 AC_SUBST(GIMP_CFLAGS)
 AC_SUBST(GIMP_LIBS)
 
-dnl AC_CHECK_LIB(png, png_create_write_struct, PNG_LIBS="-lpng", PNG_LIBS="")
-PNG_LIBS="-lpng"
-AC_SUBST(PNG_LIBS)
-AC_CHECK_HEADERS(png.h)
+dnl AC_CHECK_LIB(png12, png_create_write_struct, PNG_LIBS="-lpng12", PNG_LIBS="")
+png_modules="libpng12 >= 1.2.0 libpng12 <= 1.3.0"
+PKG_CHECK_MODULES(PNG12, [$png_modules])
+AC_CHECK_HEADERS(libpng12/png.h)
+
+AC_SUBST(PACKAGE_CFLAGS, "$PNG12_CFLAGS $PACKAGE_CFLAGS")
+AC_SUBST(PACKAGE_LIBS, "$PNG12_LIBS $PACKAGE_LIBS")
+AC_SUBST(PNG_LIBS, "$PNG12_LIBS")
 
 AC_CHECK_HEADERS(stdio.h)
 AC_CHECK_HEADERS(libgimp/gimp.h)