Update INSTALL
Update INSTALL

add `autogen.sh` step
murador/xsp,murador/xsp,murador/xsp,arthot/xsp,stormleoxia/xsp,arthot/xsp,stormleoxia/xsp,stormleoxia/xsp,murador/xsp,arthot/xsp,arthot/xsp,stormleoxia/xsp