FindPackageModeMakefileTest: macOS needs isysroot flag
macOS/Xcode no longer populate /usr/include. Building with the compiler directly instead of using /usr/bin/c++ can result in missing headers without the -isysroot flag. Relates: #19885
macOS/Xcode no longer populate /usr/include. Building with the compiler directly instead of using /usr/bin/c++ can result in missing headers without the -isysroot flag. Relates: #19885
mentioned in commit c299d10a
·mentioned in commit c299d10a