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Code:
pkg install llvm80
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llvm80 has no direct installation candidates, change it to llvm35? [Y/n]: n
llvm80 has no direct installation candidates, change it to llvm38? [Y/n]: n
llvm80 has no direct installation candidates, change it to llvm40? [Y/n]: n
llvm80 has no direct installation candidates, change it to llvm50? [Y/n]: n
llvm80 has no direct installation candidates, change it to llvm60? [Y/n]: n
llvm80 has no direct installation candidates, change it to llvm70? [Y/n]: n
pkg: No packages available to install matching 'llvm80' have been found in the repositories