+@@ -367,7 +367,7 @@
+ ada/doctools/xgnatugn$(build_exeext): ada/xgnatugn.adb
+ -$(MKDIR) ada/doctools
+ $(CP) $^ ada/doctools
+- cd ada/doctools && gnatmake -q xgnatugn -a0../rts
++ cd ada/doctools && gnatmake -q xgnatugn.adb -a0../rts
+
+ # Note that gnat_ugn_unw.texi does not depend on xgnatugn
+ # being built so we can distribute a pregenerated gnat_ugn_unw.info