Add the extra step to setup the 'rpath' for GMXPlugin

GeoModelXML/README.md

@@ -13,15 +13,24 @@ https://twiki.atlas-canada.ca/pub/AtlasCanada/ITk/gmx2geo.pdf
 ## How to build it
 
 If `GeoModel` is installed:
+
 ```
+# Clone
 git clone ssh://git@gitlab.cern.ch:7999/atlas/geomodelatlas/GeoModelATLAS.git
+
+# Configure, build, install locally:
 mkdir build_geomodelatlas; cd build_geomodelatlas
 cmake -DCMAKE_INSTALL_PREFIX=../install/ -DGEOMODELATLAS_BUILD_GEOMODELXML=1 ../GeoModelATLAS
 make
 make install
+
+# EXTRA STEP: Add a rpath, only needed when using a local 'install' folder 
+install_name_tool -add_rpath ../install/lib ../install/lib/libGMXPlugin.dylib
+
 cd ..
 ```
 
+
 ## How to run it
 
 Running the GMXPlugin executes the xerces parser to parse the xml file. The expression evaluator only works if the system language is set to USEnglish, thus do:
@@ -33,7 +42,7 @@ From e.g. your home directory
 
 ```
 cd install
-export GMX_FILES="../GeoModelATLAS/GeoModelXml/data/example1.xml"
+export GMX_FILES="../GeoModelATLAS/GeoModelXML/data/example1.xml"
 bin/gmex lib/libGMXPlugin.1.0.0.dylib (or .so on Linux)
 ```