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examples/parse_args.h: check in config.h if getopt.h was found

--- a/examples/parse_args.h

+++ b/examples/parse_args.h

@@ -18,6 +18,12 @@

 */

+#include "config.h"

+

+#ifdef HAVE_GETOPT_H

+#include <getopt.h>

+#endif

+

 extern int verbose;

 // input / output

 extern int usejack;

@@ -63,6 +69,7 @@

 void usage (FILE * stream, int exit_code)

 {

+#ifdef HAVE_GETOPT_H

   fprintf (stream, "usage: %s [ options ] \n", prog_name);

   fprintf (stream,

       "       -i      --input            input file\n"

@@ -106,6 +113,10 @@

       "       -v      --verbose          be verbose\n"

       "       -h      --help             display this message\n"

       );

+#else /* HAVE_GETOPT_H */

+  fprintf (stream, "warning: compiled with getopt.h, no argument parsing\n");

+  fprintf (stream, "usage: %s <filename> \n", prog_name);

+#endif /* HAVE_GETOPT_H */

   exit (exit_code);

 }

@@ -112,6 +123,7 @@

 int

 parse_args (int argc, char **argv)

 {

+#ifdef HAVE_GETOPT_H

   const char *options = "hv"

     "i:r:B:H:"

 #ifdef PROG_HAS_JACK

@@ -157,11 +169,13 @@

     {"force-overwrite",       0, NULL, 'f'},

     {NULL,                    0, NULL, 0}

   };

+#endif /* HAVE_GETOPT_H */

   prog_name = argv[0];

   if (argc < 1) {

     usage (stderr, 1);

     return -1;

   }

+#ifdef HAVE_GETOPT_H

   do {

     next_option = getopt_long (argc, argv, options, long_options, NULL);

     switch (next_option) {

@@ -235,6 +249,7 @@

     }

   }

   while (next_option != -1);

+#endif /* HAVE_GETOPT_H */

   // if unique, use the non option argument as the source

   if ( source_uri == NULL ) {