Index: configh.in
===================================================================
--- configh.in	(revision 6827)
+++ configh.in	(working copy)
@@ -182,6 +182,7 @@
 #undef HAVE_SYS_DIR_H
 #undef HAVE_NDIR_H
 #undef HAVE_SCANDIR
+#undef HAVE_SCANDIR_POSIX
 
 /* If not set fltk will define it's own versions of these string
    functions. By including the fltk/string.h header file you will
Index: src/filename_list.cxx
===================================================================
--- src/filename_list.cxx	(revision 6826)
+++ src/filename_list.cxx	(working copy)
@@ -62,6 +62,9 @@
   // This version is when we define our own scandir (WIN32 and perhaps
   // some Unix systems):
   int n = scandir(d, list, 0, sort);
+#elif defined(HAVE_SCANDIR_POSIX)
+  // POSIX (2008) defines the comparison function like this:
+  int n = scandir(d, list, 0, (int(*)(const dirent **, const dirent **))sort);
 #elif defined(__linux) || defined (__FreeBSD__) || defined (__NetBSD__)
   int n = scandir(d, list, 0, (int(*)(const void*,const void*))sort);
 #elif defined(__hpux) || defined(__CYGWIN__)
Index: configure.in
===================================================================
--- configure.in	(revision 6826)
+++ configure.in	(working copy)
@@ -333,6 +333,25 @@
         AC_DEFINE(HAVE_SCANDIR)
     fi])
 
+dnl Do we have the POSIX compatible scandir() prototype?
+AC_CACHE_CHECK([whether we have the POSIX compatible scandir() prototype],
+    ac_cv_cxx_scandir_posix,[
+	AC_LANG_SAVE
+	AC_LANG_CPLUSPLUS
+	AC_TRY_COMPILE([
+	  # include <dirent.h>
+	  int func (const char *d, dirent ***list, void *sort) {
+	    int n = scandir(d, list, 0, (int(*)(const dirent **, const dirent **))sort);
+	  }
+	],[
+	], ac_cv_cxx_scandir_posix=yes, ac_cv_cxx_scandir_posix=no)
+	AC_LANG_RESTORE
+    ])
+
+if test "$ac_cv_cxx_scandir_posix" = yes; then
+    AC_DEFINE(HAVE_SCANDIR_POSIX)
+fi
+
 dnl String headers and functions...
 AC_CHECK_HEADER(string.h,AC_DEFINE(HAVE_STRING_H))
 AC_CHECK_HEADER(strings.h,AC_DEFINE(HAVE_STRINGS_H))