Googletest/gtets: fatal error: gtest.h: No such file or directory

I have built gtest from source. I have created static libraries. But When i am running my tests, it is giving error that is 'fatal error: gtest.h: No such file or directory'. I have included the path. gtest.h is present in include/gtest folder. I do not know why i am getting this error. Can you help me?