Ben Boeckel 2ab118a859 FindGTK2: handle old libsigc++ versions ...

Old versions of `libsigc++` do not have the version macros inside of its
`sigc++config.h` header. Assume nothing about such headers and report
version "zero".

Fixes: #16654

2017-02-20 11:58:57 -05:00

36 KiB

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