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Here are the options for downloading:
Log in to this site as the anonymous user (see the Login link) and follow the /leaves link. Then find the top-most entry and click that. That will generate a zip file containing the latest checked-in source code.
You can use Fossil to check out the tree directly:
~> fossil clone \ http://anonymous:firstname.lastname@example.org/cgi-bin/parsepp.cgi \ parsepp.fsl
(All on one line.)
That will copy the repository to parsepp.fsl, which you can then open with:
~> mkdir parsepp ~> cd parsepp ~> fossil open ../parsepp.fsl
That checks out the files under the current dir. The example code is in test.cpp and the implementation lives in parsepp*.hpp. A Makefile for GNU Make is included, and it "should" build as-is on any system hosting gcc and GNU Make 3.81+.