How to build a library on ROS?

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I installed lsd_slam and ros-indigo. To use lsd_slam library, I downloaded source code and run rosmake lsd_slam.

I try to modify content of this library files. I add below line to 248th line in main_on_images.cpp under lsd_slam/lsd_slam_core/src. Then I run rosmake lsd_slam to build.

    printf("getCurrentPoseEstimate\n");

I run lsd_slam with dataset using below command :

rosrun lsd_slam_core dataset_slam _files:=<files> _hz:=<hz> _calib:=<calibration_file>

I don't see getCurrentPoseEstimate message. How can I build a library after modifying source code on ROS?