We have actively maintained packages for FreeBSD. syslog-ng can be compiled on macOS, Solaris and other Unix-like systems, so we usually prefer if our code is portable (we provide compatibility implementations when a POSIX implementation is not possible or not worth it). When we don't want to (or can't) support something on a platform, we add auto-detection and an option to our configure script. For example, "./configure --enable-linux-caps", "./configure --disable-linux-caps".

But of course, Windows is not a requirement :)

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László Várady