diff --git a/ref_gl/gl_context.c b/ref_gl/gl_context.c
index cc2a1164..ee00a1c7 100644
--- a/ref_gl/gl_context.c
+++ b/ref_gl/gl_context.c
@@ -164,6 +164,43 @@ static void Mod_LoadModel( modtype_t desiredType, model_t *mod, const byte *buf,
 	}
 }
 
+void Mod_BrushUnloadTextures( model_t *mod )
+{
+	int i;
+
+	for( i = 0; i < mod->numtextures; i++ )
+	{
+		texture_t *tx = mod->textures[i];
+		if( !tx || tx->gl_texturenum == tr.defaultTexture )
+			continue;       // free slot
+
+		GL_FreeTexture( tx->gl_texturenum );    // main texture
+		GL_FreeTexture( tx->fb_texturenum );    // luma texture
+        }
+}
+
+void Mod_UnloadTextures( model_t *mod )
+{
+	Assert( mod != NULL );
+
+	switch( mod->type )
+	{
+	case mod_studio:
+		Mod_StudioUnloadTextures( mod->cache.data );
+		break;
+	case mod_alias:
+		Mod_AliasUnloadTextures( mod->cache.data );
+		break;
+	case mod_brush:
+		Mod_BrushUnloadTextures( mod );
+		break;
+	case mod_sprite:
+		Mod_SpriteUnloadTextures( mod->cache.data );
+		break;
+	default: gEngfuncs.Host_Error( "Mod_UnloadModel: unsupported type %d\n", mod->type );
+	}
+}
+
 qboolean Mod_ProcessRenderData( model_t *mod, qboolean create, const byte *buf )
 {
 	qboolean loaded = true;
@@ -336,45 +373,6 @@ const byte *GL_TextureData( unsigned int texnum )
 	return NULL;
 }
 
-void Mod_BrushUnloadTextures( model_t *mod )
-{
-	int i;
-
-	for( i = 0; i < mod->numtextures; i++ )
-	{
-		texture_t *tx = mod->textures[i];
-		if( !tx || tx->gl_texturenum == tr.defaultTexture )
-			continue;	// free slot
-
-		GL_FreeTexture( tx->gl_texturenum );	// main texture
-		GL_FreeTexture( tx->fb_texturenum );	// luma texture
-	}
-}
-
-void Mod_UnloadTextures( model_t *mod )
-{
-	int		i, j;
-
-	Assert( mod != NULL );
-
-	switch( mod->type )
-	{
-	case mod_studio:
-		Mod_StudioUnloadTextures( mod->cache.data );
-		break;
-	case mod_alias:
-		Mod_AliasUnloadTextures( mod->cache.data );
-		break;
-	case mod_brush:
-		Mod_BrushUnloadTextures( mod );
-		break;
-	case mod_sprite:
-		Mod_SpriteUnloadTextures( mod->cache.data );
-		break;
-	default: gEngfuncs.Host_Error( "Mod_UnloadModel: unsupported type %d\n", mod->type );
-	}
-}
-
 void R_ProcessEntData( qboolean allocate )
 {
 	if( !allocate )
diff --git a/ref_gl/gl_local.h b/ref_gl/gl_local.h
index f6a7972d..88212a74 100644
--- a/ref_gl/gl_local.h
+++ b/ref_gl/gl_local.h
@@ -34,7 +34,9 @@ GNU General Public License for more details.
 #include "pm_movevars.h"
 //#include "cvar.h"
 
+#ifndef offsetof
 #define offsetof(s,m)       (size_t)&(((s *)0)->m)
+#endif // offsetof
 
 #define ASSERT(x) if(!( x )) gEngfuncs.Host_Error( "assert failed at %s:%i\n", __FILE__, __LINE__ )
 #define Assert(x) if(!( x )) gEngfuncs.Host_Error( "assert failed at %s:%i\n", __FILE__, __LINE__ )
diff --git a/ref_gl/gl_sprite.c b/ref_gl/gl_sprite.c
index 89aac7bb..496f4ac2 100644
--- a/ref_gl/gl_sprite.c
+++ b/ref_gl/gl_sprite.c
@@ -144,9 +144,9 @@ load sprite model
 */
 void Mod_LoadSpriteModel( model_t *mod, const void *buffer, qboolean *loaded, uint texFlags )
 {
-	dsprite_t		*pin;
-	short		*numi = NULL;
-	dframetype_t	*pframetype;
+	const dsprite_t		*pin;
+	const short		*numi = NULL;
+	const dframetype_t	*pframetype;
 	msprite_t		*psprite;
 	int		i;
 
@@ -156,7 +156,7 @@ void Mod_LoadSpriteModel( model_t *mod, const void *buffer, qboolean *loaded, ui
 	if( pin->version == SPRITE_VERSION_Q1 || pin->version == SPRITE_VERSION_32 )
 		numi = NULL;
 	else if( pin->version == SPRITE_VERSION_HL )
-		numi = (short *)(buffer + sizeof( dsprite_hl_t ));
+		numi = (const short *)((const byte*)buffer + sizeof( dsprite_hl_t ));
 
 	r_texFlags = texFlags;
 	sprite_version = pin->version;
@@ -168,21 +168,21 @@ void Mod_LoadSpriteModel( model_t *mod, const void *buffer, qboolean *loaded, ui
 		rgbdata_t	*pal;
 	
 		pal = gEngfuncs.FS_LoadImage( "#id.pal", (byte *)&i, 768 );
-		pframetype = (dframetype_t *)(buffer + sizeof( dsprite_q1_t )); // pinq1 + 1
+		pframetype = (const dframetype_t *)((const byte*)buffer + sizeof( dsprite_q1_t )); // pinq1 + 1
 		gEngfuncs.FS_FreeImage( pal ); // palette installed, no reason to keep this data
 	}
 	else if( *numi == 256 )
-	{	
-		byte	*src = (byte *)(numi+1);
+	{
+		const byte	*src = (const byte *)(numi+1);
 		rgbdata_t	*pal;
-	
+
 		// install palette
 		switch( psprite->texFormat )
 		{
 		case SPR_INDEXALPHA:
 			pal = gEngfuncs.FS_LoadImage( "#gradient.pal", src, 768 );
 			break;
-		case SPR_ALPHTEST:		
+		case SPR_ALPHTEST:
 			pal = gEngfuncs.FS_LoadImage( "#masked.pal", src, 768 );
 			break;
 		default:
@@ -190,7 +190,7 @@ void Mod_LoadSpriteModel( model_t *mod, const void *buffer, qboolean *loaded, ui
 			break;
 		}
 
-		pframetype = (dframetype_t *)(src + 768);
+		pframetype = (const dframetype_t *)(src + 768);
 		gEngfuncs.FS_FreeImage( pal ); // palette installed, no reason to keep this data
 	}
 	else 
@@ -298,7 +298,7 @@ void Mod_LoadMapSprite( model_t *mod, const void *buffer, size_t size, qboolean
 	temp.width = w;
 	temp.height = h;
 	temp.type = pix->type;
-	temp.flags = pix->flags;	
+	temp.flags = pix->flags;
 	temp.size = w * h * gEngfuncs.Image_GetPFDesc(temp.type)->bpp;
 	temp.buffer = Mem_Malloc( r_temppool, temp.size );
 	temp.palette = NULL;