diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 7d2322e3..fcedccb4 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -4,16 +4,27 @@ on: [push]
 
 jobs:
   ctest:
-    runs-on: ubuntu-20.04
+    runs-on: ${{ matrix.os }}
+
+    strategy:
+      matrix:
+        os: ["ubuntu-22.04", "macos-11", "ubuntu-20.04"]
+      fail-fast: false
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
 
       - name: apt
+        if: ${{ runner.os == 'Linux' }}
         run: |
           sudo apt update
           sudo apt install liblapack-dev openmpi-bin libopenmpi-dev libscalapack-openmpi-dev
 
+      - name: brew
+        if: ${{ runner.os == 'macOS' }}
+        run: |
+          brew install openmpi scalapack libomp
+
       - name: pip
         run: |
           python -m pip install numpy
@@ -26,7 +37,13 @@ jobs:
         working-directory: ${{runner.workspace}}/build
         shell: bash
         run: |
-          cmake -DCMAKE_VERBOSE_MAKEFILE=ON $GITHUB_WORKSPACE
+          if [ ${{ runner.os }} = "macOS" ] ; then
+            # CONFIG=apple requires gfortran but macOS runner has not, but gfortran-11, 12, ...
+            ln -s `which gfortran-11` gfortran
+            env PATH=`pwd`:$PATH HOMEBREW_PREFIX=/usr/local cmake -DCONFIG=apple -DCMAKE_VERBOSE_MAKEFILE=ON $GITHUB_WORKSPACE
+          else
+            cmake -DCMAKE_VERBOSE_MAKEFILE=ON $GITHUB_WORKSPACE
+          fi
 
       - name: build
         working-directory: ${{runner.workspace}}/build
diff --git a/config/apple.cmake b/config/apple.cmake
index 9b197129..73082407 100644
--- a/config/apple.cmake
+++ b/config/apple.cmake
@@ -1,15 +1,19 @@
 # for Apple clang compiler
 # additional libomp and gfortran installation required
 # mac computers are suggested to use this configuration for better performance
+
+if(NOT $ENV{HOMEBREW_PREFIX})
+  message(FATAL "Homebrew is not installed. Please install Homebrew first.")
+endif()
+
 set(CMAKE_C_COMPILER "clang" CACHE STRING "" FORCE)
 set(CMAKE_CXX_COMPILER "clang++" CACHE STRING "" FORCE)
 set(CMAKE_C_FLAGS_DEBUG "-g -O0 -Wall  -Wformat -Werror=format-security")
 set(CMAKE_C_FLAGS_RELEASE "-O3 -Wno-unknown-pragmas -Wno-logical-not-parentheses")
-set(CMAKE_Fortran_COMPILER "gfortran" CACHE STRING "" FORCE)
+# set(CMAKE_Fortran_COMPILER "gfortran" CACHE STRING "" FORCE)
 
 # OpenMP with libomp
-set(CMAKE_EXE_LINKER_FLAGS "-L/usr/local/lib -lomp") 
-set(OpenMP_C_FLAGS "-Xpreprocessor -fopenmp" CACHE STRING "" FORCE) 
+set(CMAKE_EXE_LINKER_FLAGS "-L$ENV{HOMEBREW_PREFIX}/opt/libomp/lib -lomp") 
+set(OpenMP_C_FLAGS "-I$ENV{HOMEBREW_PREFIX}/opt/libomp/include -Xpreprocessor -fopenmp" CACHE STRING "" FORCE) 
 set(OpenMP_C_LIB_NAMES "")
 set(CMAKE_OSX_SYSROOT "")
-