--- configure.ac.orig	2018-11-07 18:12:55 UTC
+++ configure.ac
@@ -122,6 +122,33 @@ if test "$tX_threads" = "no"; then
 	AC_MSG_ERROR([** failed to detect pthreads implementation **])
 fi
 
+AC_CHECK_FUNC(scandir,
+    if test "x$uname" = xSunOS -o "x$uname" = xQNX; then
+        AC_MSG_WARN(Not using $uname scandir emulation function.)
+    else
+        AC_DEFINE(HAVE_SCANDIR, 1, [Has scandir])
+    fi)
+
+dnl Do we have the POSIX compatible scandir() prototype?
+AC_CACHE_CHECK([whether we have the POSIX compatible scandir() prototype],
+    ac_cv_cxx_scandir_posix,[
+       AC_LANG_SAVE
+       AC_LANG_CPLUSPLUS
+       AC_TRY_COMPILE([
+         #include <dirent.h>
+         int func (const char *d, dirent ***list, void *sort) {
+           int n = scandir(d, list, 0, (int(*)(const dirent **, const dirent **))sort);
+         }
+       ],[
+       ], ac_cv_cxx_scandir_posix=yes, ac_cv_cxx_scandir_posix=no)
+       AC_LANG_RESTORE
+    ])
+
+if test "$ac_cv_cxx_scandir_posix" = yes; then
+    AC_DEFINE(HAVE_SCANDIR_POSIX, 1, [scandir conforms to POSIX])
+fi
+
+
 
 AC_SEARCH_LIBS([dlclose], [dl])