Here's an example: #include <mpi.h>double f() { double timer = MPI_Wtime(); return timer;} What I am searching for is some set of mock MPI functions, so I can #include <mpi_mocks.h> instead of mpi.h and get it compiled without linking to MPI library. It could also be something like #define MOCK which will trigger this behavior in mpi.h. It feels, like I've stumbled on something like this, but I cannot find it right now.