BUG: scandir() prototype variation according to the GNU libc version taken into account

Utilities/FLTK/src/filename_list.cxx

@@ -71,7 +71,13 @@ int fl_filename_list(const char *d, dirent ***list,
   // The vast majority of UNIX systems want the sort function to have this
   // prototype, most likely so that it can be passed to qsort without any
   // changes:
-  int n = scandir(d, list, 0, (int(*)(const void*,const void*))sort);
+
+#if ( defined(__GLIBC__) && __GLIBC_PREREQ(2, 10) )
+  int n = scandir(d, list, 0, (int(*)(const dirent **, const dirent **))sort);
+#else
+  int n = scandir(d, list, 0, (int(*)(const void*, const void*))sort);
+#endif /* ( defined(__GLIBC__) && __GLIBC_PREREQ(2, 10) ) */
+
 #else
   // This version is when we define our own scandir (WIN32 and perhaps
   // some Unix systems) and apparently on IRIX: