What is the version of NNG

[zhaozhenjing]

Issue Template

I use Cross-compilation have this problem，What is the version of NNG？
CMake Error at CMakeLists.txt:57 (find_package):
Could not find a configuration file for package "nng" that is compatible
with requested version "".

The following configuration files were considered but not accepted:

/usr/local/lib/cmake/nng/nng-config.cmake, version: 1.8.0 (64bit)

Please fill in the issue as required.

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• Architecture:
• Version:
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[fengzeroz]

Using https://github.com/neugates/nng, we've make some customizations.