In particular, on systems which do not have 'llvm-config' installed, every invocation of make issues the following messages: /bin/sh: llvm-config: command not found make: llvm-config: Command not found A simple solution would be to suppress these messages by redirecting stderr to the bit-bucket within the definitions of HAVE_LLVM_VERSION and LLVM_VERSION. As an alternative, however, we move the definition of LLVM_VERSION down the file within the HAVE_LLVM conditional, which ensures that the 'llvm-config' command exists. In addition, the HAVE_LLVM_VERSION variable is replaced with an equivalent conditional expression. Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk> Signed-off-by: Christopher Li <sparse@chrisli.org>