valgrind: This formula either does not compile or function as expected on macOS versions newer than El Capitan due to an upstream incompatibility. Error: An unsatisfied requirement failed this build. Command ran: brew install --HEAD valgrind brew info valgrind ==> Requirements Required: macOS >= 10.6 ✔, macOS <= 10.11 ✘
Am marking this as a duplicate of 365327, as it goes to support of the latest macOS 10.12. That Homebrew chooses to flag that issue via a failed installation on this specific version of macOS is their choice, but not something we should ourselves track separately. *** This bug has been marked as a duplicate of bug 365327 ***