[R-pkg-devel] Using a package only at install time?

[Duncan Murdoch]

I am trying to modify the mathjaxr package so that the tarball includes 
full source code to Mathjax, but only a minified version gets installed. 
  This will save space on the user's system, and should make it run a 
tiny bit faster.

To do this, I am trying using js::uglify_files in a src/install.libs.R 
file, and that's the only place the js package is needed.  I want a way 
to say that js *must* be present to install mathjaxr, but doesn't need 
to be loaded when mathjaxr is loaded.

Adding

   LinkingTo: js

to the DESCRIPTION file seems like it would do this, but checking says:

NOTE
'LinkingTo' for ‘js’ is unused as it has no 'include' directory

Is that an ignorable NOTE?   If not, is there another strategy for 
minifying Javascript files at install time?

Duncan Murdoch