fix README.md

Author: erossignon

README.md

@@ -53,11 +53,10 @@ $npm install node-occ
 
 ## building node-occ from source : prerequisites
 
-### on Linux
 
-#### on ubuntu
+#### on (linux Ubuntu
 
-(use nodejs 12.0)
+(use nodejs 12 or 14)
 
 ```bash
 # installing nodejs and gyp utility to build extensions
@@ -71,9 +70,16 @@ sudo apt-get install cmake cmake-curses-gui g++ build-essential libtbb2
 # ------------------------------------
 git clone --recursive https://github.com/erossignon/node-occ.git
 cd node-occ
+
+# download prebuild OpenCascade Library and header files
+bash ./prepare_node.sh
+
+#
 export OCCT_PACKAGE=occt-7.2.0
 export LD_LIBRARY_PATH=`pwd`/${OCCT_PACKAGE}/lib:$LD_LIBRARY_PATH
 npm install --build-from-source
+
+# verify that everything is working OK
 make test
 ```
 

prepare_node.sh

@@ -16,15 +16,16 @@ echo "  OCCT_TARFILE     = " ${OCCT_TARFILE}
 echo "  OCCT_TARFILE_URL = " ${OCCT_TARFILE_URL}
 
 echo "--------------------------  OCCT TAR FILE ${OCCT_TARFILE}"
-ls ${OCCT_TARFILE} 
 if [ ! -f "${OCCT_TARFILE}" ]; then
-  wget -q ${OCCT_TARFILE_URL}
+  echo "downloading ${OCCT_TARFILE}"
+  wget --show-progress -q ${OCCT_TARFILE_URL}
 fi
 if [ ! -d "${OCCT_PACKAGE}" ]; then 
   echo "extracting package ${OCCT_TARFILE}"
   tar -xf ${OCCT_TARFILE}
 fi
 
+ls ${OCCT_TARFILE} 
 export LD_LIBRARY_PATH=`pwd`/${OCCT_PACKAGE}/lib:$LD_LIBRARY_PATH
 
 export VERSION_FILE=`pwd`/${OCCT_PACKAGE}/include/opencascade/Standard_Version.hxx