C/C++ : Adding Searching Include Directory

I have compiled a source code (Opendtect) using CMake. When I compile this program, the required include directory is not exist in the C/C++ searching path. Modified the Makefile is very hard, because this is the other people code.

We can copy all the include library to default C/C++ include directory (/usr/include). But, I dont recomended this. The other good method is adding searching include directory for my compiler. I get a documentation from gnu website about this :

The GNU have some of variable to adding new Include path directory to our program. Example, if we want to add new path include directory to our C++ code, we can use a command like this :

We can add this command to our user path (/home/username/.bashrc) to make permanent or only use this command in current console.

Source :
http://gcc.gnu.org/onlinedocs/gcc-4.8.1/gcc/Environment-Variables.html#Environment-Variables

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