--- squid-2.4.1.orig/src/squid.h	Thu Feb 22 22:39:14 2001
+++ squid-2.4.1/src/squid.h	Thu Jun 28 15:20:47 2001
@@ -45,10 +45,24 @@
  */
 #define CHANGE_FD_SETSIZE 1
 
-/* Cannot increase FD_SETSIZE on Linux */
+/*
+ * Cannot increase FD_SETSIZE on Linux, but we can increase __FD_SETSIZE
+ * with glibc 2.2 (or later? remains to be seen). We do this by including
+ * bits/types.h which defines __FD_SETSIZE first, then we redefine
+ * __FD_SETSIZE. Ofcourse a user program may NEVER include bits/whatever.h
+ * directly, so this is a dirty hack!
+ */
 #if defined(_SQUID_LINUX_)
-#undef CHANGE_FD_SETSIZE
-#define CHANGE_FD_SETSIZE 0
+#  undef CHANGE_FD_SETSIZE
+#  define CHANGE_FD_SETSIZE 0
+#  include <features.h>
+#  if (__GLIBC__ > 2) || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 2)
+#    if SQUID_MAXFD > DEFAULT_FD_SETSIZE
+#      include <bits/types.h>
+#      undef __FD_SETSIZE
+#      define __FD_SETSIZE SQUID_MAXFD
+#    endif
+#  endif
 #endif
 
 /*