How to make g++ search for header files in a specific directory?

A/code.cpp #include <B/file.hpp> A/a/code2.cpp #include <B/file.hpp> Compile using: g++ -I /your/source/root /your/source/root/A/code.cpp g++ -I /your/source/root /your/source/root/A/a/code2.cpp Edit: You can use environment variables to change the path g++ looks for header files. From man page: Some additional environments variables affect the behavior of the preprocessor. CPATH C_INCLUDE_PATH CPLUS_INCLUDE_PATH OBJC_INCLUDE_PATH Each variable’s value is a list of … Read more