How can I define #define in my Make files

Question

In my c/c++ files, there are multiple #define. As an example:

#ifdef LIBVNCSERVER_HAVE_LIBZ
  /* some code */
#ifdef LIBVNCSERVER_HAVE_LIBJPEG
  /* some more cod         


        

Answer 1

Don't modify your Makefile.in. (and consider using Automake and converting your Makefile.in to a much simpler Makefile.am). The whole point of those #defines is to let the configure script define them in config.h, and your source files should #include . If you are maintaining the package, you will need to write tests in configure.ac to determine whether or not the system being used has libvncserver installed with jpeg and zlib support. If you modify Makefile.in to always define them, then you are making the assumption that your code is only being built on machines where those features are available. If you make that assumption, you should still add checks to configure.ac to confirm it, and have the configure script fail if the dependencies are not met.