how to build a binary program that load relative path at linux?

[shouhuanxiaoji]

Hello,friends!
I want to compile the dolphin-emu to a binary program that load relative paths eg datadir..

I download sources package from stable branch in github and use c++-4.9 at Ubuntu 14.04 amd64.

If I use below command:

Code:

cmake
make
make install

or

Code:

cmake -D datadir=/home/xiaoji/dolphin

the path of datadir will be absolute.So after I move the whole path to another path,the program will be error: some path or some files is missing.

I want to know how to modify the cmakefile.txt? or add some parameter when use cmake command?
Thanks very much!