From c7df559e5b7025c07e7e72b457473aa683b90eb0 Mon Sep 17 00:00:00 2001
From: Andrew Kane <andrew@ankane.org>
Date: Tue, 17 Sep 2024 14:54:22 -0700
Subject: [PATCH] Prepend inc flags

---
 .github/workflows/build.yml | 4 ----
 ext/or-tools/extconf.rb     | 2 +-
 2 files changed, 1 insertion(+), 5 deletions(-)

diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 7309b6d..83055b4 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -7,12 +7,8 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - ruby: 3.3
-            os: ubuntu-22.04
           - ruby: 3.2
             os: macos-14
-          - ruby: 3.1
-            os: macos-13
     steps:
       - uses: actions/checkout@v4
       - uses: ruby/setup-ruby@v1
diff --git a/ext/or-tools/extconf.rb b/ext/or-tools/extconf.rb
index 84fb7f9..c66fa42 100644
--- a/ext/or-tools/extconf.rb
+++ b/ext/or-tools/extconf.rb
@@ -25,7 +25,7 @@
 
 # find_header and find_library first check without adding path
 # which can cause them to find system library
-$INCFLAGS << " -I#{inc}"
+$INCFLAGS.prepend("-I#{inc} ")
 # could support shared libraries for protobuf and abseil
 # but keep simple for now
 raise "libprotobuf.a not found" unless File.exist?("#{lib}/libprotobuf.a")