fix

Author: gouarin

.github/workflows/linux.yml

@@ -28,7 +28,7 @@ jobs:
 
     steps:
       - name: Install GCC
-        if: matrix.sys.compiler == "gcc"
+        if: matrix.sys.compiler == 'gcc'
         uses: egor-tensin/setup-gcc@v1
         with:
           version: ${{matrix.sys.version}}