1. Clone

git clone https://github.com/StanfordLegion/realm.git
cd realm

# Create an out-of-tree build directory
mkdir build && cd build
# Configure – pick the options that match your system
cmake .. \
      -DCMAKE_BUILD_TYPE=Release \
      -DREALM_ENABLE_OPENMP=ON \   # OpenMP support
      -DREALM_ENABLE_CUDA=OFF       # flip ON to target NVIDIA GPUs

# Compile everything
make -j$(nproc)

# (optional) run the unit tests
ctest --output-on-failure

The full list of CMake toggles is documented inside CMakeLists.txt. Common switches include:

Option Default Purpose
REALM_ENABLE_CUDA ON Build CUDA backend
REALM_ENABLE_HIP ON Build HIP/ROCm backend
REALM_ENABLE_GASNETEX ON on Linux GASNet-EX network
REALM_ENABLE_UCX ON on Linux UCX network
REALM_ENABLE_MPI OFF MPI network
REALM_LOG_LEVEL WARNING Compile-time log level

TIP: combine cmake -LAH or ccmake to explore every option.

3. Install (optional)

make install   # honour DESTDIR / CMAKE_INSTALL_PREFIX as usual

Libraries, headers and CMake packages will be placed under include/realm, lib/, and share/realm/ so that external projects can consume Realm via

find_package(Realm REQUIRED)