A short while ago, I added: set(CMAKE_OSX_DEPLOYMENT_TARGET 13.0 CACHE STRING "Minimum operating system version for deployment") to my top level CMake file. The code would not compile. So I removed the line and deleted the CMake cache and tried to rebuild. And for my pains I got this: c++: error: unsupported option '-mavx' for target 'arm64-apple-darwin24.4.0' c++: error: unsupported option '-mavx2' for target 'arm64-apple-darwin24.4.0' c++: error: unsupported option '-mfma' for target 'arm64-apple-darwin24.4.0' c++: error: unsupported option '-mssse3' for target 'arm64-apple-darwin24.4.0' This code was all compiled just fine up until this change, but now it just won't do so. Help!!! David

For the Linux version of my application which is written in C++ using Qt, I display the CHM format help files with this code: QString helpFile{ QCoreApplication::applicationDirPath() + "/Help/" + tr("DeepSkyStacker Help.chm","IDS_HELPFILE") }; QString program{ "kchmviewer" }; QStringList arguments{ "-token", "com.github.deepskystacker", helpFile }; helpProcess->startDetached(program, arguments); (helpProcess is a pointer to a QProcess object) The -token com.github.deepskystackerpart of that ensures that only a single instance of the viewer is used for any code that uses that invocation. Are there any chm file viewers for macOS that are capable of that sort of trick? The ones I've found on the App Store give minimal information and appear to be very simple minded tools that are not not intended for integration into an application as above. I know that MacPorts offers ports of kchmviewer but I'd prefer not to use either that or HomeBrew ... David