extra source path...

hi. all
I’m using eclipse 1.2.0 and QNX Momentics IDE 2.2.0 and I 'm developing a
multi-platform application.
I made a project on eclipse for qnx and add extra source files. then the
eclipse generated extra source path in common.mk file.
but the problem is extra source path is not relative path but absolute path.
so I tried to modify the path to relative path. but the eclipse seemed to
don’t recognized the relative path.

so my question is how I can use relative path as extra source path or extra
include path.