SparkFun has an Eagle library that has pads for single and dual row 0.1" headers from 1 to 40 pins.  Here is one of several 1x03 headers (single row, three pins):

![enter image description here][1]


Their library SparkFun.lbr can be [downloaded here][2].  It works with both version 5 and version 6 (I haven't tried it on version 7 yet).  They also have a set of libraries in the new XML format (version 6 and later) [here][3].


  [1]: https://i.sstatic.net/ClOBV.jpg
  [2]: https://github.com/sparkfun/Old-SparkFun-Eagle-Library
  [3]: https://github.com/sparkfun/SparkFun-Eagle-Libraries