Fixing ubuntu to use CMake 3.19

build.sh

@@ -43,14 +43,14 @@ cd "$1/openfpm_io"
 if [ x"$hostname" == x"cifarm-centos-node.mpi-cbg.de"  ]; then
 	source /opt/rh/devtoolset-7/enable
         ./install_MPI_mpich.sh $HOME/openfpm_dependencies/openfpm_io/$branch/ 4
-	export PATH="/opt/bin:$HOME/openfpm_dependencies/openfpm_io/$branch/MPI/bin/:$PATH"
+	export PATH="$HOME/openfpm_dependencies/openfpm_io/$branch/MPI/bin/:$PATH"
         ./install_BOOST.sh $HOME/openfpm_dependencies/openfpm_io/$branch/ 4
 	./install_HDF5.sh $HOME/openfpm_dependencies/openfpm_io/$branch/ 4
 fi
 
 if [ x"$hostname" == x"cifarm-ubuntu-node"  ]; then
         ./install_MPI_mpich.sh $HOME/openfpm_dependencies/openfpm_io/$branch/ 4
-	export PATH="$HOME/openfpm_dependencies/openfpm_io/$branch/MPI/bin/:$PATH"
+	export PATH="/opt/bin:$HOME/openfpm_dependencies/openfpm_io/$branch/MPI/bin/:$PATH"
 	./install_BOOST.sh $HOME/openfpm_dependencies/openfpm_io/$branch/ 4
 	./install_HDF5.sh $HOME/openfpm_dependencies/openfpm_io/$branch/ 4
 fi