Add some verbage about make environment poisoning.

Submitted by: sheldonh Ignored for two months by: imp
svn path=/head/; revision=89832
2002-01-26 21:33:07 +00:00 · 2002-01-26 21:33:07 +00:00 · 5780f3ba93 · 2020-12-20 02:59:44 +00:00
commit 5780f3ba93
parent d5af31a255
1 changed files with 7 additions and 0 deletions
--- a/7
+++ b/7
@ -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