Hi *! In the file include/Makefile.am (and the derived Makefile.in, Makefile) What is the difference between the various *_HDRS (INSTALL_DERIVED_HDRS, NOINSTALL_DERIVED_HDRS, ...)? Why is a header file in a certain _HDRS group, what are the requuirements for the header files and the groups? I hope someone can understand my question and can answer it :) regards - Marc