Add test for BSDI -- by Nigel Head and otto@mail.olympus.net.
diff --git a/configure.in b/configure.in
index d6eba15..f835b56 100644
--- a/configure.in
+++ b/configure.in
@@ -122,6 +122,13 @@
 
 AC_PROG_CC
 
+case $MACHDEP in
+bsdos*)
+    case $CC in
+    gcc) CC="$CC -D_HAVE_BSDI";;
+    esac;;
+esac
+
 case $ac_sys_system in
 hp*|HP*)
     case $CC in