From 13e34ec90d2ab814f12527ef9f943dde2da2e17f Mon Sep 17 00:00:00 2001
From: Steven Peters <scpeters@openrobotics.org>
Date: Wed, 4 Dec 2019 09:08:22 +0000
Subject: [PATCH] FormulaInstaller: rescue already attempted install

---
 Library/Homebrew/formula_installer.rb | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Library/Homebrew/formula_installer.rb b/Library/Homebrew/formula_installer.rb
index 2272f97d82..aca3adc486 100644
--- a/Library/Homebrew/formula_installer.rb
+++ b/Library/Homebrew/formula_installer.rb
@@ -598,6 +598,10 @@ class FormulaInstaller
     oh1 "Installing #{formula.full_name} dependency: #{Formatter.identifier(dep.name)}"
     fi.install
     fi.finish
+  rescue FormulaInstallationAlreadyAttemptedError
+    # We already attempted to install f as part of the dependency tree of
+    # another formula. In that case, don't generate an error, just move on.
+    nil
   rescue Exception # rubocop:disable Lint/RescueException
     ignore_interrupts do
       tmp_keg.rename(installed_keg) if tmp_keg && !installed_keg.directory?