diff -uNr src.orig/X3D_x3d.c src/X3D_x3d.c
--- src.orig/X3D_x3d.c	Fri Jun  4 02:03:16 1999
+++ src/X3D_x3d.c	Fri Jun  4 23:51:29 1999
@@ -1054,9 +1054,15 @@
 
 /* An 16 bit TrueColor ? */
 
+#if defined(__linux__)
+#define SIXTEEN  15
+
+       if(XMatchVisualInfo(g->dpy, screen, 15, TrueColor, &vInfo)){
+#else
 #define SIXTEEN  16
 
        if(XMatchVisualInfo(g->dpy, screen, 16, TrueColor, &vInfo)){
+#endif
          g->depth = SIXTEEN;
        }else{