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-rw-r--r--Library/Homebrew/build_environment.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/Library/Homebrew/build_environment.rb b/Library/Homebrew/build_environment.rb
index 7bff387b1..4f4812bcd 100644
--- a/Library/Homebrew/build_environment.rb
+++ b/Library/Homebrew/build_environment.rb
@@ -25,7 +25,7 @@ class BuildEnvironment
end
def modify_build_environment(receiver)
- receiver.instance_eval(&proc)
+ receiver.instance_eval(&proc) if self.proc
end
def marshal_dump