manually create dirs

Author: perazz

.github/workflows/CI.yml

@@ -52,6 +52,11 @@ jobs:
         which gfortran-${GCC_V}
         which gfortran
         # Backport gfortran shared libraries to version 9 folder (hardcoded in fpm 0.3.0 executable)
+        mkdir /usr/local/opt/gcc@9
+        mkdir /usr/local/opt/gcc@9/lib
+        mkdir /usr/local/opt/gcc@9/lib/gcc
+        mkdir /usr/local/opt/gcc@9/lib/gcc/9
+        mkdir /usr/local/lib/gcc/9
         ln -fs /usr/local/opt/gcc@${GCC_V}/lib/gcc/${GCC_V}/libquadmath.0.dylib /usr/local/opt/gcc@9/lib/gcc/9/libquadmath.0.dylib 
         ln -fs /usr/local/opt/gcc@${GCC_V}/lib/gcc/${GCC_V}/libgfortran.5.dylib /usr/local/opt/gcc@9/lib/gcc/9/libgfortran.5.dylib
         ln -fs /usr/local/lib/gcc/${GCC_V}/libgcc_s.1.dylib /usr/local/lib/gcc/9/libgcc_s.1.dylib