Install XC library and include it in CI build

.github/workflows/makefile.yml

@@ -29,7 +29,7 @@ jobs:
     - name: Install Dependencies
       run: |
         sudo apt update
-        sudo apt install openmpi-bin libopenmpi-dev libfftw3-dev libblas3 liblapack3 libscalapack-openmpi-dev
+        sudo apt install openmpi-bin libopenmpi-dev libfftw3-dev libblas3 liblapack3 libscalapack-openmpi-dev libxc-dev
     - name: Check compiler version
       run: ${{matrix.fc}} --version
       

src/gha.make

@@ -4,10 +4,9 @@ ARFLAGS=
 # Set BLAS and LAPACK libraries
 BLAS= -llapack -lblas
 # LibXC compatibility (LibXC below) or Conquest XC library
-# Conquest XC library
-XC_LIBRARY = CQ
-XC_LIB =
-XC_COMPFLAGS =
+XC_LIBRARY = LibXC_v5
+XC_LIB = -lxcf90 -lxc
+XC_COMPFLAGS = -I/usr/include
 # Set FFT library
 FFT_LIB=-lfftw3
 FFT_OBJ=fft_fftw3.o