diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
new file mode 100644
index 0000000..a8c41c5
--- /dev/null
+++ b/.github/workflows/test.yml
@@ -0,0 +1,46 @@
+name: Build and Test QDyn
+# Suggestion from ChatGPT
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  build-and-test:
+    runs-on: ubuntu-latest
+
+    steps:
+      # Checkout the code
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      # Install dependencies
+      - name: Install dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y gfortran make wget tar
+
+      # Download, build, and install FFTW library
+      - name: Build and install FFTW
+        run: |
+          # Specify the FFTW version
+          FFTW_VERSION=3.3.10
+          wget http://www.fftw.org/fftw-${FFTW_VERSION}.tar.gz
+          tar -xzf fftw-${FFTW_VERSION}.tar.gz
+          cd fftw-${FFTW_VERSION}
+          ./configure --enable-shared --prefix=/usr/local
+          make -j$(nproc)
+          sudo make install
+          cd ..
+
+      # Build the project using make
+      - name: Build the project
+        run: make
+
+      # Run tests using make
+      - name: Run tests
+        run: make tests
\ No newline at end of file
diff --git a/.github/workflows/test_v2.yml b/.github/workflows/test_v2.yml
new file mode 100644
index 0000000..7ed57c6
--- /dev/null
+++ b/.github/workflows/test_v2.yml
@@ -0,0 +1,65 @@
+name: CI
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+
+permissions:
+  contents: read
+
+env:
+  FORCE_COLOR: 1
+
+jobs:
+  intel_build:
+    name: Intel OneAPI build
+    runs-on: ubuntu-20.04
+    env:
+      FC: mpiifort
+      APT_PACKAGES: >-
+        intel-oneapi-compiler-fortran
+        intel-oneapi-mpi
+        intel-oneapi-mpi-devel
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 2
+
+      #   - name: Install fftw
+      #     run: |
+      #       echo "Entering FFTW folder"
+      #       cd fftw
+      #       echo "Unpacking FFTW"
+      #       tar -xf fftw.tar.gz
+      #       echo "Compiling FFTW"
+      #       cd fftw
+      #       bash compile.sh
+
+      - name: Add Intel repository
+        run: |
+          wget https://apt.repos.intel.com/intel-gpg-keys/GPG-PUB-KEY-INTEL-SW-PRODUCTS-2023.PUB
+          sudo apt-key add GPG-PUB-KEY-INTEL-SW-PRODUCTS-2023.PUB
+          rm GPG-PUB-KEY-INTEL-SW-PRODUCTS-2023.PUB
+          echo "deb https://apt.repos.intel.com/oneapi all main" | sudo tee /etc/apt/sources.list.d/oneAPI.list
+          sudo apt-get update
+
+      - name: Install Intel oneAPI compiler
+        run: |
+          sudo apt-get install ${{ env.APT_PACKAGES }}
+          source /opt/intel/oneapi/setvars.sh
+          printenv >> $GITHUB_ENV
+
+      - name: Install fftw & build QDyn
+        run: |
+          echo "Entering FFTW folder"
+          cd fftw
+          echo "Unpacking FFTW"
+          tar -xf fftw.tar.gz
+          echo "Compiling FFTW"
+          cd fftw
+          bash compile.sh
+          echo "Compile QDyn"
+          cd ../../src
+          make clean && make
diff --git a/fftw/fftw.tar.gz b/fftw/fftw.tar.gz
index c6481e5..03a7e5c 100644
Binary files a/fftw/fftw.tar.gz and b/fftw/fftw.tar.gz differ
diff --git a/src/Makefile b/src/Makefile
index 068e09d..599d7e9 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -3,23 +3,27 @@
 # Compiler
 FC = gfortran
 FFLAGS =
-#FFTW library needed
-# LIBS = -L/home/janos/Programs/fftw/fftw-3.3.10/lib -lfftw3 -lm -llapack
-# LIBS = -L/Users/janosj/Documents/Programs/fftw/fftw-3.3.10/lib -lfftw3 -lm 
+# FFTW library needed
 LIBS = -L/Users/janosj/Documents/Programs/fftw/fftw-3.3.10/lib -lfftw3 -lm -llapack
 LDLIBS = -lfftw3 # This is necessary only on clusters, not on MacOS
 
+# for Github tests, I use different fftw library path
+GitHub_LIBS = -L/usr/local/lib -lfftw3 -lm -llapack
+
 # Name of program
 OUT = qdyn
 
 #======================================================================
 
 # List of all files (NAME ALL F90)
-OBJS = vars.o fparser.o fftw.o utils.o init.o propag.o qdyn.o
+OBJS = vars.o fparser.o fftw.o utils.o init.o exactfactor.o propag.o qdyn.o
 
 myprogram: $(OBJS) 
 	   $(FC) -o $(OUT) ${LIBS} ${FFLAGS} $(OBJS) ${LDLIBS}
 
+github-build: $(OBJS)
+	   $(FC) -o $(OUT) ${GitHub_LIBS} ${FFLAGS} $(OBJS) ${LDLIBS}
+
 clean:
 	/bin/rm -f *.o *.mod $(OUT)