Canonical Cross Compiling w/ System Dependencies, PKG Config, --sysroot and --search-prefix?

a lot of projects use system dependencies - link xy.so or parse xy.h. some build steps even include host-tools-with-system-dependencies. As i understand the zig build system has following mechanisms: per module/step: addIncludePath, similar to -I, populates headers addLibraryPath similar to -L, populates libraries addSystemFrameworkPath similar to -F, populates frameworks linkSystemLibrary (this actually links a system library i.e. x11 but uses pkg-config under the hood to find libs on the ...