-ACI_PACKAGE_SAVED(XML,[XML library (version XML2)],xml2-config,,,:)
-ACI_PACKAGE([SimGrid],[the SimGrid simulator],[SG_init],[-lsimgrid],[simgrid.h])
+dnl A CI_PACKAGE_SAVED(XML,[XML library (version XML2)],xml2-config,,,:)
+ACI_PACKAGE([SimGrid],[the SimGrid simulator],[SG_init],[-lsimgrid],[simgrid.h],,:)
+AM_CONDITIONAL(HAVE_SG,test x$HAVE_SimGrid = xyes)