diff -rupN ../quakespasm-svn-clean/Quake/gl_model.c ./Quake/gl_model.c
--- ../quakespasm-svn-clean/Quake/gl_model.c	2010-09-21 17:58:12.000000000 +0200
+++ ./Quake/gl_model.c	2010-09-21 18:02:42.000000000 +0200
@@ -382,6 +382,8 @@ void Mod_LoadTextures (lump_t *l)
 	extern byte *hunk_base;
 //johnfitz
 
+	extern cvar_t r_externaltexture_fix; //mk
+
 	//johnfitz -- don't return early if no textures; still need to create dummy texture
 	if (!l->filelen)
 	{
@@ -433,7 +435,18 @@ void Mod_LoadTextures (lump_t *l)
 		if (!isDedicated) //no texture uploading for dedicated server
 		{
 			if (!Q_strncasecmp(tx->name,"sky",3)) //sky texture //also note -- was Q_strncmp, changed to match qbsp
+			//mk -- begin
+			{
+                                if (r_externaltexture_fix.value) {
+					if (strstr(tx->name,"sky4")) {
+						if (CRC_Block((byte *)(tx+1), tx->width * tx->height)==13039)
+							sprintf(tx->name,"sky1");
+						Con_Printf("  using %s\n", tx->name);
+					}
+				}
+			//mk -- end
 				Sky_LoadTexture (tx);
+			} // mk
 			else if (tx->name[0] == '*') //warping texture
 			{
 				//external textures -- first look in "textures/mapname/" then look in "textures/"
@@ -475,6 +488,53 @@ void Mod_LoadTextures (lump_t *l)
 				//external textures -- first look in "textures/mapname/" then look in "textures/"
 				mark = Hunk_LowMark ();
 				COM_StripExtension (loadmodel->name + 5, mapname);
+				//mk begin
+				if (r_externaltexture_fix.value) {
+					if (strstr(tx->name,"plat_top1")) {
+						if (CRC_Block((byte *)(tx+1), tx->width * tx->height)==24428)
+							sprintf(tx->name,"plat_top1_cable");
+						else
+							sprintf(tx->name,"plat_top1_bolt");
+						Con_Printf("  using %s\n", tx->name);
+					}
+
+					if (strstr(tx->name,"metal5_2")) {
+						if (CRC_Block((byte *)(tx+1), tx->width * tx->height)==49173)
+							sprintf(tx->name,"metal5_2_x");
+						else
+							sprintf(tx->name,"metal5_2_arc");
+						Con_Printf("  using %s\n", tx->name);
+					}
+
+					if (strstr(tx->name,"metal5_4")) {
+						if (CRC_Block((byte *)(tx+1), tx->width * tx->height)==20977)
+							sprintf(tx->name,"metal5_4_double");
+						else
+							sprintf(tx->name,"metal5_4_arc");
+						Con_Printf("  using %s\n", tx->name);
+					}
+					if (strstr(tx->name,"metal5_8")) {
+						if (CRC_Block((byte *)(tx+1), tx->width * tx->height)==48444)
+							sprintf(tx->name,"metal5_8_rune");
+						else
+							sprintf(tx->name,"metal5_8_back");
+						Con_Printf("  using %s\n", tx->name);
+					}
+					if (strstr(tx->name,"metal5_8")) {
+						if (CRC_Block((byte *)(tx+1), tx->width * tx->height)==48444)
+							sprintf(tx->name,"metal5_8_rune");
+						else
+							sprintf(tx->name,"metal5_8_back");
+						Con_Printf("  using %s\n", tx->name);
+					}
+					if (strstr(tx->name,"window03")) {
+						if (CRC_Block((byte *)(tx+1), tx->width * tx->height)==63697) // e4m2 variant
+							sprintf(tx->name,"window03_e4m2");
+						Con_Printf("  using %s\n", tx->name);
+					}
+				}
+				//mk end
+
 				sprintf (filename, "textures/%s/%s", mapname, tx->name);
 				data = Image_LoadImage (filename, &fwidth, &fheight);
 				if (!data)
diff -rupN ../quakespasm-svn-clean/Quake/gl_rmain.c ./Quake/gl_rmain.c
--- ../quakespasm-svn-clean/Quake/gl_rmain.c	2010-09-21 17:58:12.000000000 +0200
+++ ./Quake/gl_rmain.c	2010-09-21 17:59:44.000000000 +0200
@@ -103,6 +103,8 @@ cvar_t	r_nolerp_list = {"r_nolerp_list",
 extern cvar_t	r_vfog;
 //johnfitz
 
+cvar_t  r_externaltexture_fix = {"r_externaltexture_fix","0", true}; //mk
+
 qboolean r_drawflat_cheatsafe, r_fullbright_cheatsafe, r_lightmap_cheatsafe, r_drawworld_cheatsafe; //johnfitz
 
 /*
Binärdateien ../quakespasm-svn-clean/Quake/gl_rmain.o and ./Quake/gl_rmain.o sind verschieden.
diff -rupN ../quakespasm-svn-clean/Quake/gl_rmisc.c ./Quake/gl_rmisc.c
--- ../quakespasm-svn-clean/Quake/gl_rmisc.c	2010-09-21 17:58:12.000000000 +0200
+++ ./Quake/gl_rmisc.c	2010-09-21 17:59:54.000000000 +0200
@@ -45,6 +45,8 @@ extern cvar_t r_lerpmove;
 extern cvar_t r_nolerp_list;
 //johnfitz
 
+extern cvar_t r_externaltexture_fix; //mk
+
 extern float load_subdivide_size; //johnfitz -- remember what subdivide_size value was when this map was loaded
 
 extern cvar_t gl_subdivide_size; //johnfitz -- moved here from gl_model.c
@@ -240,6 +242,8 @@ void R_Init (void)
 	Cvar_RegisterVariable (&r_nolerp_list, R_NoLerpList_f);
 	//johnfitz
 
+	Cvar_RegisterVariable (&r_externaltexture_fix, NULL);//mk
+
 	Cvar_RegisterVariable (&gl_subdivide_size, NULL); //johnfitz -- moved here from gl_model.c
 
 	R_InitParticles ();