Index: make.conf
===================================================================
RCS file: /home/ncvs/src/share/examples/etc/make.conf,v
retrieving revision 1.279
diff -u -r1.279 make.conf
--- make.conf	17 Jan 2007 12:43:06 -0000	1.279
+++ make.conf	25 May 2007 15:08:52 -0000
@@ -40,6 +40,17 @@
 #   AMD64 architecture: opteron, athlon64, nocona, prescott, core2
 #   Intel ia64 architecture: itanium2, itanium
 #
+# On the Intel x86 and AMD architectures, you can use gcc to determine
+# determine the processor type of the compiling machine by using the
+# following command:
+#
+# gcc -v -x c -E -mtune=native /dev/null -o /dev/null 2>&1 | grep mtune | sed -e 's/.*mtune=//'
+#
+# set CPUTYPE to the value returned for mtune.
+#
+# NOTE: DO NOT set CPUTYPE to 'native' in make.conf, as CPUTYPE is used to
+#       set MACHINE_CPU in share/mk/bsd.cpu.mk.
+#
 # (?= allows to buildworld for a different CPUTYPE.)
 #
 #CPUTYPE?=pentium3