Looks good. Committed to trunk as r2104 and 1.0.x as r2105. Thanks!
On-demand imports for crypt and nis in account backends
Review Request #976 — Created Aug. 19, 2009 and submitted
crypt and nis are not available under Windows, but were imported unconditionally, so that using custom backends under Windows failed. This patch should fix this by performing the imports conditionally.