hadley/ggplot2 — pull request #628 by simonohanlon101 (2012-07-19 09:36:19+00:00)
Title: Use rgeos instead of gpclib for fortify polygon operations

Following a discussion with Roger Bivand (author and contributor of many spatial packages for R) on r-sig-geo mailing list he suggested that rgeos should be used over gpclib (due to gpclib's restrictive license) for polygon operations in the fortify methods for spatial data.
Original discussion is [here:](http://r-sig-geo.2731867.n2.nabble.com/Help-with-gpclib-tp7580479p7580542.html)