diff --git a/configure.in b/configure.in
index 53d3cfb14377e730e13453adcd1bdc5db2bdfb0a..71730250582f68f74793ef25b8e264c097681206 100644
--- a/configure.in
+++ b/configure.in
@@ -475,7 +475,7 @@ dnl ** check for full ANSI header (.h) files
 AC_HEADER_STDC
 
 dnl ** check for specific header (.h) files that we are interested in
-AC_CHECK_HEADERS(Files.h assert.h console.h ctype.h dirent.h errno.h fcntl.h float.h ftw.h grp.h ieee754.h malloc.h memory.h nlist.h pascal.h pwd.h sgtty.h siginfo.h signal.h stat.h stdlib.h stdarg.h string.h sys/fault.h sys/file.h sys/ioctl.h sys/limits.h sys/mman.h sys/param.h sys/procfs.h sys/resource.h sys/signal.h sys/socket.h netinet/tcp.h sys/stat.h sys/syscall.h sys/time.h sys/timeb.h sys/timers.h sys/times.h sys/types.h sys/utsname.h sys/vadvise.h sys/wait.h termio.h termios.h time.h types.h unistd.h utime.h values.h vfork.h readline/readline.h bfd.h)
+AC_CHECK_HEADERS(Files.h assert.h console.h ctype.h dirent.h errno.h fcntl.h float.h ftw.h grp.h ieee754.h malloc.h memory.h nlist.h pascal.h pwd.h sgtty.h siginfo.h signal.h stat.h stdlib.h stdarg.h string.h sys/fault.h sys/file.h sys/ioctl.h sys/limits.h sys/mman.h sys/param.h sys/procfs.h sys/resource.h sys/signal.h sys/socket.h netinet/tcp.h sys/stat.h sys/syscall.h sys/time.h sys/timeb.h sys/timers.h sys/times.h sys/types.h sys/utsname.h sys/vadvise.h sys/wait.h termio.h termios.h time.h types.h unistd.h utime.h values.h vfork.h readline/readline.h bfd.h winsock.h)
 
 dnl ** check for DOS include files
 AC_CHECK_HEADERS(dos.h conio.h io.h std.h) 
diff --git a/mk/config.h.in b/mk/config.h.in
index 5a2d8fc532cca233676d76050b05f01fb66aab1d..21d1533a3fdbf69d6f19fc7d8f2d7ff823cf85b5 100644
--- a/mk/config.h.in
+++ b/mk/config.h.in
@@ -449,6 +449,9 @@
 /* Define if you have the <windows.h> header file.  */
 #undef HAVE_WINDOWS_H
 
+/* Define if you have the <winsock.h> header file.  */
+#undef HAVE_WINSOCK_H
+
 /* Define if you have the bfd library (-lbfd).  */
 #undef HAVE_LIBBFD