Sebastian 8fb794e731
libsigc++.cfg: Add configuration for library libsigc++ (#2291)
* libsigc++.cfg: Add configuration for library libsigc++

Reference: https://libsigcplusplus.github.io/libsigcplusplus/

* Make code compatible with libsigc++-2.0 instead of 3.0

Since Version 3.0 C++14 is required which is not (fully) supported in
some older GCC versions.
2019-10-26 17:37:14 +02:00
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