diff -ru findutils-4.5.9.orig/lib/arg-max.h findutils-4.5.9/lib/arg-max.h
--- findutils-4.5.9.orig/lib/arg-max.h	2010-10-27 14:00:12 +0200
+++ findutils-4.5.9/lib/arg-max.h	2010-10-27 14:07:01 +0200
@@ -28,6 +28,11 @@
  * actually does not work (i.e. it is larger than the real limit).
  * The value of ARG_MAX is reportedly smaller than the real limit.
  *
+ * Unfortunately, ARG_MAX is not sufficient, and not anywhere near
+ * the real limit. by trial and error, the limit on all interix
+ * versions seems to be somewhere near (above) 50K. so we use this
+ * value, instead of relying on any of the broken defines...
+ *
  * I considered a configure test for this which allocates an argument
  * list longer than ARG_MAX but shorter than _SC_ARG_MAX and then
  * tries to exec something, but this will not work for us when
@@ -44,6 +49,10 @@
  */
 # undef _SC_ARG_MAX
 # define BC_SC_ARG_MAX_IS_UNRELIABLE 1
+
+# undef ARG_MAX
+# define ARG_MAX 50000
+
 #endif
 
 #endif