lilypond: caveats about updating MacTeX

Closes #29784

1 files changed, 8 insertions, 0 deletions

diff --git a/Library/Formula/lilypond.rb b/Library/Formula/lilypond.rb
index 6dad22ee1..ad5cf711a 100644
--- a/Library/Formula/lilypond.rb
+++ b/Library/Formula/lilypond.rb
@@ -92,6 +92,14 @@ class Lilypond < Formula
     end
   end
 
+  def caveats; <<-EOS.undent
+    Lilypond requires a newer version of mpost. Assuming a standard install of
+    MacTeX, you will need to use `tlmgr` update its installed packages:
+
+      sudo tlmgr update --self && sudo tlmgr update --all
+    EOS
+  end
+
   test do
     (testpath/'test.ly').write <<-EOS.undent
       \\header { title = "Do-Re-Mi" }