Can't navigate code in Custom Makefile project

[Yang Zhang]

Hi, I'm using KDevelop 3.5.3 on Ubuntu 8.10 and I can't seem to
navigate C++ code. The status bar always says "(unresolved)", and
right-clicking on an element in the source doesn't let me jump to its
definition/declaration. I had created a Custom Makefile project and
imported some existing sources - it's just a handful of .cc's and
.h's, and a Makefile. Any hints? Thanks in advance.
--
Yang Zhang
http://www.mit.edu/~y_z/