if ["%CASROOT%"] == [""] set "CASROOT=%SCRIPTROOT%"
rem ----- Define path to 3rdparty products -----
-set "THIRDPARTY_DIR=@3RDPARTY_DIR@"
+if ["%THIRDPARTY_DIR%"] == [""] set "THIRDPARTY_DIR=@3RDPARTY_DIR@"
if ["%ARCH%"] == ["32"] set VCARCH=x86
if ["%ARCH%"] == ["64"] set VCARCH=amd64