Hi Hailong, I'm trying to install software-testing and having exactly same problem you had before. Javier told you to add "-lrt" in Makefile, but I'm not sure where to put it. I've added following lines at cloud9/Makefile but it does not work. CFLAGS = "$CFLAGS -lrt" CPPFLAGS = "$CPPFLAGS -lrt" It seems like you have solved this problem. Could you let me know how to link librt library?
-- *Jinchun Kim*
