diff -ur libgpio.orig/serial/Makefile.am libgpio/serial/Makefile.am
--- libgpio.orig/serial/Makefile.am	2000-11-15 11:45:52.000000000 -0500
+++ libgpio/serial/Makefile.am	2002-06-16 08:04:15.000000000 -0400
@@ -1,6 +1,6 @@
 ## Specify some includes and versioning
 INCLUDES = -I../ $(VERSION_FLAGS) -I$(top_srcdir)/include
-VERSION_FLAGS = -DLIBGPIO_VERSION=\"@LIBGPIO_VERSION@\" -DHAVE_TERMIOS_H
+VERSION_FLAGS = -DLIBGPIO_VERSION=\"@LIBGPIO_VERSION@\" -DHAVE_TERMIOS_H -D_BSD_SOURCE
 CFLAGS = @CFLAGS@ @IOLIB_CFLAGS@ -g
 LDFLAGS = @LDFLAGS@ -g