Hi,
Inspired by other discussions on this forum, I figured out a solution.
(Issue with macOS 15.4 Xcode 16.3 - #6 by suter_a)
For those who are interested in compiling from source, here is what I found to be useful:
brew install cmake gfortran python3 boost openssl gsl tbb davix xrootd
Then use the following options when running CMake:
cmake -Wno-dev "$ROOT_SOURCE" \
-DCMAKE_INSTALL_PREFIX="$ROOT_INSTALL" \
-DCMAKE_CXX_STANDARD=17 \
-Dfftw3=ON \
-Dfortran=ON \
-Dimt=ON \
-Dboost=ON \
-Dgsl=ON \
-Dmathmore=ON \
-Droofit=ON \
-Dvdt=OFF \
-Dbuiltin_vdt=OFF \
-DCMAKE_OSX_SYSROOT=$(xcrun --sdk macosx --show-sdk-path)