Recursive variable 'LIBS' references itself (eventually).

just now ,I open the IDE on qnx 6.3.0, It promotes the update of
workspace automatically . If I choose cancel , then the IDE exits. So
I choose ok.
after that , the foregone qnx c/c++ projects compile with
error:Recursive variable ‘LIBS’ references itself (eventually). the
phab project has no problem.

What should I do ? any advice will be appreciated ! Thanks