diff --git a/GL/framebuffer.c b/GL/framebuffer.c
index a7e6532..b30c07f 100644
--- a/GL/framebuffer.c
+++ b/GL/framebuffer.c
@@ -325,18 +325,6 @@ void APIENTRY glGenerateMipmap(GLenum target) {
     gl_assert(_glIsMipmapComplete(tex));
 }
 
-/* generate mipmaps for any image provided by the user and then pass them to OpenGL */
-GLAPI GLvoid APIENTRY gluBuild2DMipmaps(GLenum target, GLint internalFormat,
-                                       GLsizei width, GLsizei height,
-                                       GLenum format, GLenum type, const void *data){
-    /* 2d texture, level of detail 0 (normal), 3 components (red, green, blue),
-	 width & height of the image, border 0 (normal), rgb color data,
-	 unsigned byte data, and finally the data itself. */
-    glTexImage2D(GL_TEXTURE_2D, 0, 3, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, data);
-
-    glGenerateMipmap(GL_TEXTURE_2D);
-}
-
 GLenum APIENTRY glCheckFramebufferStatusEXT(GLenum target) {
     if(target != GL_FRAMEBUFFER_EXT) {
         _glKosThrowError(GL_INVALID_ENUM, __func__);
diff --git a/GL/glu.c b/GL/glu.c
index 9b2f48d..68a2028 100644
--- a/GL/glu.c
+++ b/GL/glu.c
@@ -15,3 +15,17 @@ void APIENTRY gluPerspective(GLdouble angle, GLdouble aspect,
 void APIENTRY gluOrtho2D(GLdouble left, GLdouble right, GLdouble bottom, GLdouble top) {
     glOrtho(left, right, bottom, top, -1.0f, 1.0f);
 }
+
+/* generate mipmaps for any image provided by the user and then pass them to OpenGL */
+GLint APIENTRY gluBuild2DMipmaps(GLenum target, GLint internalFormat,
+                                       GLsizei width, GLsizei height,
+                                       GLenum format, GLenum type, const void *data){
+    /* 2d texture, level of detail 0 (normal), 3 components (red, green, blue),
+	 width & height of the image, border 0 (normal), rgb color data,
+	 unsigned byte data, and finally the data itself. */
+    glTexImage2D(GL_TEXTURE_2D, 0, 3, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, data);
+
+    glGenerateMipmap(GL_TEXTURE_2D);
+    // FIXME return glu error codes
+    return 0;
+}