> root -l -b

Args:
	cling4root
	-I/home/alex/build_root/etc
	-I/home/alex/build_root/etc/cling
	-I/home/alex/build_root/include
	-include-pch
	/home/alex/build_root/etc/allDict.cxx.pch
	-Wno-undefined-inline
	-fsigned-char
	-Xclang
	-load
	-Xclang
	/home/alex/build_root/etc/cling/plugins/lib/clad.so

error: unknown argument: '-Xclang'