Fix compilation warning with getopt_long() on MinGW.

diff --git a/src/getopt.h b/src/getopt.h
index 20a7dc7..ead9878 100644 (file)
--- a/src/getopt.h
+++ b/src/getopt.h
@@ -41,9 +41,9 @@ extern "C"
   /* function prototypes */
   int getopt (int argc, char **argv, char *optstring);
   int getopt_long (int argc, char **argv, const char *shortopts,
-                   GETOPT_LONG_OPTION_T * longopts, int *longind);
+                   const GETOPT_LONG_OPTION_T * longopts, int *longind);
   int getopt_long_only (int argc, char **argv, const char *shortopts,
-                        GETOPT_LONG_OPTION_T * longopts, int *longind);
+                        const GETOPT_LONG_OPTION_T * longopts, int *longind);
 
 #ifdef __cplusplus
 };