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+++ b/UPDATING
@@ -812,6 +812,13 @@ COMMON ITEMS:
or several minor releases, or when several months have passed
on the -current branch).
+ Sometimes, obscure build problems are the result of environment
+ poisoning. This can happen because the make utility reads its
+ environment when searching for values for global variables.
+ To run your build attempts in an "environmental clean room",
+ prefix all make commands with 'env -i '. See the env(1) manual
+ page for more details.
+
To build a kernel
-----------------
If you are updating from a prior version of FreeBSD (even one just
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