# http://in3www.epfl.ch/~schaffne/linux-2.4-bsd-expr.patch
The following makes it possible to compile linux 2.4.19 to 2.4.25 on Mac OS X,
where "expr" doesn't understand the "length" construct
(which it doesn't have to, according to SuSv3
(see http://www.opengroup.org/onlinepubs/007904975/utilities/expr.html)
See also http://sources.redhat.com/ml/crossgcc/2004-02/msg00131.html

Fixes error
  expr: syntax error
  KERNELRELEASE "2.4.21" exceeds 64 characters
  make: *** [include/linux/version.h] Error 1


diff -ur linux-2.4.23-old/Makefile linux-2.4.23/Makefile
--- linux-2.4.23-old/Makefile	2003-12-09 14:27:56.000000000 +0100
+++ linux-2.4.23/Makefile	2003-12-09 14:28:37.000000000 +0100
@@ -353,7 +353,7 @@
 	@rm -f .ver1
 
 include/linux/version.h: ./Makefile
-	@expr length "$(KERNELRELEASE)" \<= $(uts_len) > /dev/null || \
+	@expr "$(KERNELRELEASE)" : '.*' \<= $(uts_len) > /dev/null || \
 	  (echo KERNELRELEASE \"$(KERNELRELEASE)\" exceeds $(uts_len) characters >&2; false)
 	@echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" > .ver
 	@echo \#define LINUX_VERSION_CODE `expr $(VERSION) \\* 65536 + $(PATCHLEVEL) \\* 256 + $(SUBLEVEL)` >> .ver