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;