./autogen.sh fails with: ./configure: line 17356: syntax error near unexpected token `NO_STRICT_ALIASING_CFLAGS,' ./configure: line 17356: `XDT_SUPPORTED_FLAGS(NO_STRICT_ALIASING_CFLAGS, -fno-strict-aliasing)' seems like the XDT_SUPPORTED_FLAGS(NO_STRICT_ALIASING_CFLAGS, -fno-strict-aliasing) line in configure.in.in isn't processed.
Your xfce4-dev-tools is too old.
Brian is always right