[Rd] build time dependency

[Romain Francois]

Hello,

Is there such thing as a build time dependency between packages : 
package B needs package A so that it can build, but once built it lives 
without it.

For example depending on the ant package to compile java code, or depend 
on roxygen to roxygenize the code, ...

Adding roxygen to Depends works, but then the installed package does not 
depend on it and therefore loads it for nothing. Maybe I can remove 
roxygen from the Depends as part of the ./configure[.win] ...

Romain

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Romain Francois
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