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--- install_actflow [2025/08/30 12:52] – [MacOS] rajit
+++ install_actflow [2025/11/21 10:55] (current) – [MacOS] rajit
@@ Line 96: / Line 96: @@
   ...
 </code>
-then chances are you have a known issue recent LLVM versions and MacOS ([[https://github.com/llvm/llvm-project/issues/155606|github issue]]).  The workaround that fixes this at least for the actflow build (see the discussion for details, this may not necessarily be a proper fix) is to edit the ''.cfg'' file installed with LLVM to include
+then chances are you have a known issue in recent LLVM versions on MacOS ([[https://github.com/llvm/llvm-project/issues/155606|github issue]]).  The workaround that fixes this at least for the actflow build (see the discussion for details, this may not necessarily be a proper fix) is to edit the ''.cfg'' file installed with LLVM to include
-the location of the LLVM C++ standard library.
+the location of the LLVM C++ standard library. The [[https://github.com/llvm/llvm-project/issues/155606|github issue]] has details and various workarounds, and the root cause appears to be that while the LLVM compiler uses a specific algorithm to find include paths, it uses a different one to find libraries; so the system C++ standard library is being used instead of the LLVM-provided C++ standard library. Explicitly including the LLVM-provided library fixes this issue in the build.
+For example, on a recent MacOS/homebrew setup, this required editing ''.cfg'' files in ''/opt/homebrew/etc/clang/'', replacing the line ''-i sysroot /Library/Developer/CommandLineTools/SDKs/MacOSX26.sdk'' with
+''/opt/homebrew/opt/llvm/lib/c++/libc++.1.0.dylib -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX26.sdk'' (see the github issue for details).
 ==== OpenMP message ====