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-rw-r--r--Library/Homebrew/formula_installer.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/Library/Homebrew/formula_installer.rb b/Library/Homebrew/formula_installer.rb
index b5c5e7fb5..77e0ab29b 100644
--- a/Library/Homebrew/formula_installer.rb
+++ b/Library/Homebrew/formula_installer.rb
@@ -449,7 +449,7 @@ class FormulaInstaller
if (req.optional? || req.recommended?) && build.without?(req)
Requirement.prune
- elsif req.build? && use_default_formula
+ elsif req.build? && use_default_formula && req_dependency.installed?
Requirement.prune
elsif install_requirement_formula?(req_dependency, req, install_bottle_for_dependent)
deps.unshift(req_dependency)