regex-opt: use libstdc++

Fixes #26104.

1 files changed, 5 insertions, 0 deletions

diff --git a/Library/Formula/regex-opt.rb b/Library/Formula/regex-opt.rb
index ac1f75448..8b12a801b 100644
--- a/Library/Formula/regex-opt.rb
+++ b/Library/Formula/regex-opt.rb
@@ -6,6 +6,11 @@ class RegexOpt < Formula
   sha1 'a3b58af5a173a9b77ede7d0cb01831ae7a315b38'
 
   def install
+    # regex-opt uses _Find_first() in std::bitset, which is a
+    # nonstandard extension supported in libstdc++ but not libc++
+    # See: http://lists.w3.org/Archives/Public/www-archive/2006Jan/0002.html
+    ENV.libstdcxx if ENV.compiler == :clang
+
     system "make", "CC=#{ENV.cc}", "CXX=#{ENV.cxx}"
     bin.install 'regex-opt'
   end