K 10
svn:author
V 6
swills
K 8
svn:date
V 27
2016-04-27T20:19:16.050306Z
K 7
svn:log
V 235
Improve gem.mk

* Check for valid args to USES=gem
* Make autoplist default, allowing it to be specified (which is a no-op), or
  turned off
* Add sanity checks for USE_RUBYGEMS RUBYGEM_AUTOPLIST

Requested by:	mat
Discussed with:	mat

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