[julia-users] building a package without rebuilding a REQUIRES pkg

[Jeffrey Sarnoff]

If I have a package MainPkg with a  REQUIRE file that holds "HelperPkg", 
and I do
Pkg.add("HelperPkg");Pkg.build("HelperPkg");
is there a way to 
Pkg.add("MainPkg")
without automatically rebuilding (the already current) HelperPkg?