boostorg/spirit — pull request #71 by mlang (2014-11-20 20:18:03+00:00)
Title: Prefix calcN example executables with x3_ to avoid error.

At least on Linux, b2 fails to link calc{7,8,9} since the exe name is
identical to the subdirectory containing the source files.

Prefix all calc examples with x3_ to actually allow to link them.