Add gcc libdir symlinks for macOS

Author: wpbonelli

setup-fortran.sh

@@ -9,15 +9,24 @@ install_gcc_brew()
   ln -fs /usr/local/bin/gcc-${version} /usr/local/bin/gcc
   ln -fs /usr/local/bin/g++-${version} /usr/local/bin/g++
 
-  # link lib dir for previous GCC versions to avoid missing .dylib issues
+  # check which version we installed
+  # sed instead of head to take first line avoids ruby broken pipe issues
+  # https://stackoverflow.com/a/2845541/6514033
+  ver=$(brew info gfortran | sed -n 1p | cut -d' ' -f 4)
+
+  # link homebrew lib dir to other common lib dir locations to avoid missing .dylib issues
+  sudo mkdir -p /opt/local/lib
+  sudo ln -fs usr/local/Cellar/gcc/${ver}/lib/gcc/${version} /opt/local/lib/libgcc
+
+  # link lib dirs for previous GCC versions to avoid missing .dylib issues
   for (( i=12; i>4; i-- ))
   do
     gcc_lib_path="/usr/local/opt/gcc/lib/gcc/$i"
     if [ -d $gcc_lib_path ]; then
       echo "found $gcc_lib_path"
       for (( j=$i; j>4; j-- ))
       do
-        ln -fs /usr/local/opt/gcc/lib/gcc/$i /usr/local/opt/gcc/lib/gcc/$j
+	sudo ln -fs /usr/local/opt/gcc/lib/gcc/$i /usr/local/opt/gcc/lib/gcc/$j
       done
       break
     fi