1 files changed, 13 insertions, 1 deletions
diff --git a/Library/Homebrew/extend/ARGV.rb b/Library/Homebrew/extend/ARGV.rb
index eec2172a2..bb26d453f 100644
--- a/Library/Homebrew/extend/ARGV.rb
+++ b/Library/Homebrew/extend/ARGV.rb
@@ -185,7 +185,19 @@ module HomebrewArgvExtension
   end
 
   def build_from_source?
-    switch?("s") || include?("--build-from-source") || !!ENV["HOMEBREW_BUILD_FROM_SOURCE"]
+    switch?("s") || include?("--build-from-source")
+  end
+
+  def build_all_from_source?
+    !!ENV["HOMEBREW_BUILD_FROM_SOURCE"]
+  end
+
+  # Whether a given formula should be built from source during the current
+  # installation run.
+  def build_formula_from_source?(f)
+    return true if build_all_from_source?
+    return false unless (build_from_source? || build_bottle?)
+    formulae.any? { |argv_f| argv_f.full_name == f.full_name }
   end
 
   def flag?(flag)