updated for version 7.4.487
Problem:    ":sign jump" may use another window even though the file is
            already edited in the current window.
Solution:   First check if the file is in the current window. (James McCoy)
diff --git a/src/testdir/Make_os2.mak b/src/testdir/Make_os2.mak
index cfade3f..5f3dc13 100644
--- a/src/testdir/Make_os2.mak
+++ b/src/testdir/Make_os2.mak
@@ -47,6 +47,7 @@
 		test_mapping.out \
 		test_options.out \
 		test_qf_title.out \
+		test_signs.out \
 		test_utf8.out
 
 .SUFFIXES: .in .out