The macOS version is built with Xcode 10.3 as a minimum, and requires Xcode 10.3 for 64-bit builds. Minimum system version for development is macOS 10.13 (High Sierra).
The viewer will also build on Xcode 11.3 but you will run in to signing issues unless you have an Apple Developer ID.
The Windows version is built with Microsoft Visual Studio Community edition 2013 on Windows 10 Pro 64-bit.
Both build environments requires Python 2.7.8, cmake and Linden Lab's autobuild 1.0.
The viewer will also build on Xcode 11.3 but you will run in to signing issues unless you have an Apple Developer ID.
The Windows version is built with Microsoft Visual Studio Community edition 2013 on Windows 10 Pro 64-bit.
Both build environments requires Python 2.7.8, cmake and Linden Lab's autobuild 1.0.
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