sip: fix --HEAD

Closes #26469.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

1 files changed, 8 insertions, 7 deletions

diff --git a/Library/Formula/sip.rb b/Library/Formula/sip.rb
index 4749f676e..ff71fc11f 100644
--- a/Library/Formula/sip.rb
+++ b/Library/Formula/sip.rb
@@ -24,16 +24,17 @@ class Sip < Formula
   end
 
   def install
+    if build.head?
+      # Link the Mercurial repository into the download directory so
+      # build.py can use it to figure out a version number.
+      ln_s downloader.cached_location + ".hg", ".hg"
+      # build.py doesn't run with python3
+      system "python", "build.py", "prepare"
+    end
+
     pythons.each do |python, version|
       ENV["PYTHONPATH"] = lib/"python#{version}/site-packages"
 
-      if build.head?
-        # Link the Mercurial repository into the download directory so
-        # build.py can use it to figure out a version number.
-        ln_s downloader.cached_location + ".hg", ".hg"
-        system python, "build.py", "prepare"
-      end
-
       # Note the binary `sip` is the same for python 2.x and 3.x
       system python, "configure.py",
                      "--deployment-target=#{MacOS.version}",