Hi, As I said above, I'm an absolute beginner of autotools and I understand quite nothing to it I am porting an RTOS on a prarvirtualizer, and my RTOS uses autotools to compile. So the RTOS don't use external libs to be built. But to do my porting I have to use a lib and its header inside the RTOS source code. So I understood that I have to add autoconf macro on configure.ac and Makefile.in. But witch and where For the where question: Can I insert the macro on the project to level configure.ac or Makefile.in or should I insert it in the directory of the code that uses the header. Thanks for your help. Nicolas _______________________________________________ Autoconf mailing list Autoconf@xxxxxxx http://lists.gnu.org/mailman/listinfo/autoconf