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-rw-r--r--Library/Homebrew/cmd/upgrade.rb8
1 files changed, 8 insertions, 0 deletions
diff --git a/Library/Homebrew/cmd/upgrade.rb b/Library/Homebrew/cmd/upgrade.rb
index 8ae231002..e8fc9c0f8 100644
--- a/Library/Homebrew/cmd/upgrade.rb
+++ b/Library/Homebrew/cmd/upgrade.rb
@@ -3,6 +3,14 @@ require "cmd/outdated"
module Homebrew
def upgrade
+ if !MacOS.can_build?
+ bf = ARGV.collect_build_flags
+
+ if !bf.empty?
+ raise BuildFlagsError.new(bf)
+ end
+ end
+
Homebrew.perform_preinstall_checks
if ARGV.named.empty?