diff --git a/.github/workflows/cona-isa.yml b/.github/workflows/cona-isa.yml
index ca60c4c..18f36f9 100644
--- a/.github/workflows/cona-isa.yml
+++ b/.github/workflows/cona-isa.yml
@@ -8,7 +8,10 @@ on:
 jobs:
   # Rustlang
   build-rustlang:
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [macos-latest, windows-latest, ubuntu-18.04]
     steps:
       - uses: actions/checkout@v2
       - name: building..
diff --git a/Makefile b/Makefile
index aa7d570..041ca4e 100644
--- a/Makefile
+++ b/Makefile
@@ -26,7 +26,7 @@ build-rustlang:
 
 # FIXME: Add logic
 build-clang-c:
-	@ exit "$NEUTRALCODE"
+	@ exit 1
 
 build-gcc-c:
 	@ # Make a build directory