Hi, I have a library file libefsl.a that is supposed to include a header file efs.h that I require. I am writing a program for a microcontroller in AVR-Studio or WINAVR have included the header file as follows: #include <efs.h> However when I compile I am told efs.h no such file... I have included the directory of the libefsl.a file in the compiler but cannot get my program to compile. I am wondering if I am following the correct procedure? Or else how are you meant to include header files that live in a lib.a file?? Regards.