John Emmas 557031ca11 Remove confusion over ambiguous symbols ...

libboost and libsigc++ both contain symbols called _1() / _2() etc. Forcing the use of namespace sigc causes us to use the ones from sigc++ when in fact, we want the ones from boost.

Hopefully this fix will work for all compilers.

2016-06-18 11:41:12 +01:00

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