Index: adm/templates/env.install.sh.in
--- adm/templates/env.install.sh.in.orig
+++ adm/templates/env.install.sh.in
@@ -4,7 +4,7 @@ aScriptPath=${BASH_SOURCE%/*}; if [ -d "${aScriptPath}
 
 # ----- For compatibility with external application using CASROOT -----
 if [ "${CASROOT}" == "" ]; then
-  export CASROOT="@INSTALL_DIR@"
+  export CASROOT="@INSTALL_DIR@/share/opencascade"
 fi
 
 # ----- Define path to 3rdparty products -----
