Document the PERL5LIB fix

git-svn-id: http://svn.perl.org/modules/Module-Build/trunk@8377 50811bd7-b8ce-0310-adc1-d9db26280581
FROGGS · Dec 11, 2006 · 9f4ee06 · 9f4ee06
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@@ -2,6 +2,12 @@ Revision history for Perl extension Module::Build.
 
 0.2806
 
+ - On some systems (haven't identified the actual problem yet)
+   $ENV{PERL5LIB} can grow to enormous enough sizes that we can't
+   launch any more subprocesses because the environment table is full.
+   Now we detect such situations and trim the directory list to only
+   include directories that actually exist, listed only once each.
+
  - Silence a warning in M::B::ModuleInfo that happens when the author
    is using the "$VERSION = eval $VERSION" idiom.