diff --git a/configure.in b/configure.in
index 4b6ef76..fa95f4f 100644
--- a/configure.in
+++ b/configure.in
@@ -96,7 +96,42 @@ dnl
 dnl <sys/socket.h> isn't among the list of standard headers that autoconf checks,
 dnl but POSIX requires <sys/socket.h> for socklen_t to be defined.
 dnl
-AC_CHECK_TYPES(socklen_t,,,[
+AC_CHECK_TYPES(socklen_t,,,
+[
+#include <stdio.h>
+#if HAVE_SYS_TYPES_H
+# include <sys/types.h>
+#endif
+#if HAVE_SYS_STAT_H
+# include <sys/stat.h>
+#endif
+#if STDC_HEADERS
+# include <stdlib.h>
+# include <stddef.h>
+#else
+# if HAVE_STDLIB_H
+#  include <stdlib.h>
+# endif
+#endif
+#if HAVE_STRING_H
+# if !STDC_HEADERS && HAVE_MEMORY_H
+#  include <memory.h>
+# endif
+# include <string.h>
+#endif
+#if HAVE_STRINGS_H
+# include <strings.h>
+#endif
+#if HAVE_INTTYPES_H
+# include <inttypes.h>
+#else
+# if HAVE_STDINT_H
+#  include <stdint.h>
+# endif
+#endif
+#if HAVE_UNISTD_H
+# include <unistd.h>
+#endif
 #ifdef HAVE_SYS_SOCKET_H
 # include <sys/socket.h>
 #endif