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The gnulib 'error' module uses 'program_name'. On some platforms -- but not Linux / glibc -- it references it as: extern char *program_name; This means when you compile libguestfs on non-glibc (eg. Mac OS X) gnulib requires 'program_name' as an external string reference, which we don't provide. This change doesn't define this string reference for gnulib, but it does change the name of the macro we use to avoid conflicts if we eventually need to export 'program_name' as a string. Thanks: Margaret Lewicka