diff -ur /usr/ports/x11/XFree86/work/xc/programs/Xserver/hw/xfree86/common_hw/SlowBcopy.c programs/Xserver/hw/xfree86/common_hw/SlowBcopy.c
--- /usr/ports/x11/XFree86/work/xc/programs/Xserver/hw/xfree86/common_hw/SlowBcopy.c	Sun Jan  5 11:58:24 1997
+++ programs/Xserver/hw/xfree86/common_hw/SlowBcopy.c	Tue Dec  8 10:05:56 1998
@@ -37,7 +37,12 @@
  * Martin Ostermann (ost@comnets.rwth-aachen.de) - Apr.-Sep. 1996
  */
 
+#ifdef linux
 unsigned long _bus_base(void);
+#define isJensen() (!_bus_base())
+#else
+#define isJensen() 0
+#endif
 
 #ifdef TEST_JENSEN_CODE /* define to test the Sparse addressing on a non-Jensen */
 #define SPARSE (5)
@@ -50,7 +55,7 @@
      unsigned char *src, *dst;
      int count;
 {
-    if (!_bus_base()) /* Jensen */
+    if (isJensen())
     {
 	unsigned long addr;
 	long result;
@@ -74,7 +79,7 @@
      unsigned char *src, *dst;
      int count;
 {
-    if (!_bus_base()) /* Jensen */
+    if (isJensen())
     {
 	unsigned long addr;