Branch: refs/heads/master
  Home:   https://github.com/synfig/synfig
  Commit: b142f0e39a89b37e83a4eb6c53932abce110e411
      
https://github.com/synfig/synfig/commit/b142f0e39a89b37e83a4eb6c53932abce110e411
  Author: ice0 <konop...@gmail.com>
  Date:   2022-07-12 (Tue, 12 Jul 2022)

  Changed paths:
    M ETL/configure.ac
    M synfig-core/configure.ac
    M synfig-core/test/test_base.h
    M synfig-studio/configure.ac
    M synfig-studio/test/test_base.h

  Log Message:
  -----------
  build(autotools): fixed node test build (#2744)

This fixes this error:
```
test_base.h:64:33: error: ambiguous overload for ‘operator<<’
(operand types are ‘std::basic_ostream<char>’ and ‘std::nullptr_t’)
```

The issue was that in c++17 `std::ostream operator<<(nullptr_t)`
template is already implemented.
Unfortunately, `AX_CXX_COMPILE_STDCXX` does not add the
`-std=c++11` flag, so the compiler can use the newer C++ standard.




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