Fix the test for socklen_t so that it searches through sys/socket.h.

configure.in

@@ -356,7 +356,7 @@ AC_HEADER_STDC
 AC_CHECK_HEADERS(dlfcn.h fcntl.h limits.h locale.h ncurses.h pthread.h \
 signal.h stdarg.h stddef.h stdlib.h thread.h unistd.h utime.h \
 sys/audioio.h sys/file.h sys/lock.h \
-sys/param.h sys/select.h sys/time.h sys/times.h \
+sys/param.h sys/select.h sys/socket.h sys/time.h sys/times.h \
 sys/un.h sys/utsname.h sys/wait.h)
 AC_HEADER_DIRENT
 
@@ -380,7 +380,6 @@ AC_TYPE_PID_T
 AC_TYPE_SIGNAL
 AC_TYPE_SIZE_T
 AC_TYPE_UID_T
-AC_CHECK_TYPE(socklen_t, int)
 
 # Sizes of various common basic types
 AC_CHECK_SIZEOF(int)
@@ -1080,6 +1079,15 @@ else AC_MSG_RESULT(no)
 fi],
 [AC_MSG_RESULT(no)])
 
+# THIS MUST BE LAST, IT CAN BREAK OTHER TESTS!
+# Add sys/socket.h to confdefs.h
+cat >> confdefs.h <<\EOF
+#ifdef HAVE_SYS_SOCKET_H
+#include <sys/socket.h>
+#endif
+EOF
+AC_CHECK_TYPE(socklen_t, int)
+
 # generate output files
 AC_OUTPUT(Makefile \
  Objects/Makefile \