This example relies on:
  - the GNUstep libraries (libgnustep-gui, libgnustep-base)
    and their dependencies (libiconv or glibc, and ffcall)
  - the Objective C runtime libraries (libobjc)

GNUstep applications don't need to be configured or installed in order to run;
all you need is to
  1. Prepare your environment, as described in the GNUstep-HOWTO
  2. make
  3. openapp Hello
