parse args and deal with cgal

src/scripts/mknemo.d/falcON2

@@ -11,6 +11,9 @@ branch=master
 branch=autoconf                                   # during development
 cgal=0
 
+for arg in "$@"; do
+  export "$arg"
+done
 
 echo "falcON2: using url=$url and git branch=$branch"
 
@@ -37,14 +40,16 @@ source falcon_start.sh
 
 #   if a local version is needed
 if [ $cgal = 1 ]; then
+    ln -s inc include
     v=5.6.2
     wget https://github.com/CGAL/cgal/releases/download/v${v}/CGAL-${v}.tar.xz
     tar xf CGAL-${v}.tar.xz
-    cd CGAL-${v}
+    pushd CGAL-${v}
     mkdir build
     cd build
     cmake  -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=$FALCON ..
     make install
+    popd
 fi