Undefined reference on Ubuntu 11.04

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Hello! I have simple subscriber project, but there some problems. I'm using Ubuntu 11.04 2.6.38-11-generic, gcc version 4.5.2 (Ubuntu/Linaro 4.5.2-8ubuntu4), GNU ld (GNU Binutils for Ubuntu) 2.21.0.20110327 and GNU Make 3.81. I have

1. /project/include/DepthListener.h,
2. /project/src/DepthListener.cpp,
3. /project/src/depthConverter.cpp.

When I try to make project, I receive next errors:

CMakeFiles/depthListener.dir/src/depthListener.o: In function `main':
/ros/depthListen/src/depthListener.cpp:6: undefined reference to `DepthConverter::DepthConverter()'
/ros/depthListen/src/depthListener.cpp:6: undefined reference to `DepthConverter::~DepthConverter()'
/ros/depthListen/src/depthListener.cpp:6: undefined reference to `DepthConverter::~DepthConverter()'
collect2: ld returned 1 exit status

As I undestand, make does not see DepthListener.cpp file and problem somewhere in CMakeLists.txt.

There are all files:

1. DepthConverter.h

2. CMakeLists.txt

3. DepthConverter.cpp

4. depthListener

Thanks for help!