diff -ur libglpng-1.45.old/src/glpng.c libglpng-1.45.orig/src/glpng.c

--- libglpng-1.45.old/src/glpng.c	2015-11-25 11:04:11.348145744 +0000

+++ libglpng-1.45.orig/src/glpng.c	2015-11-25 11:07:49.996825162 +0000

@@ -29,7 +29,7 @@

 #include <GL/gl.h>

 #include <stdlib.h>

 #include <math.h>

-#include "png/png.h"

+#include <png.h>

 /* Used to decide if GL/gl.h supports the paletted extension */

 #ifdef GL_COLOR_INDEX1_EXT

@@ -113,6 +113,7 @@

 	}

 }

+#ifdef _WIN32

 static int ExtSupported(const char *x) {

 	static const GLubyte *ext = NULL;

 	const char *c;

@@ -129,6 +130,7 @@

 	return 0;

 }

+#endif

 #define GET(o) ((int)*(data + (o)))

@@ -478,6 +480,7 @@

 		glPixelStorei(GL_UNPACK_ALIGNMENT, 1);

 		#ifdef SUPPORTS_PALETTE_EXT

+		#ifdef _WIN32

 		if (PalettedTextures && mipmap >= 0 && trans == PNG_SOLID && color == PNG_COLOR_TYPE_PALETTE) {

 			png_colorp pal;

 			int cols;

@@ -502,6 +505,7 @@

 		}

 		else

 		#endif

+		#endif

 		if (trans == PNG_SOLID || trans == PNG_ALPHA || color == PNG_COLOR_TYPE_RGB_ALPHA || color == PNG_COLOR_TYPE_GRAY_ALPHA) {

 			GLenum glformat;

 			GLint glcomponent;