--- gcc-interface/Makefile.in   (revision 192944)
+++ gcc-interface/Makefile.in   (working copy)
@@ -2610,7 +2610,7 @@ $(RTSDIR)/s-oscons.ads: ../stamp-gnatlib
        (cd $(RTSDIR) ; \
            $(OSCONS_CPP) ; \
            $(OSCONS_EXTRACT) ; \
-           ../bldtools/oscons/xoscons)
+           ../bldtools/oscons/xoscons s-oscons)
 
 # Don't use semicolon separated shell commands that involve list expansions.
 # The semicolon triggers a call to DCL on VMS and DCL can't handle command