ROOT installation with CEF

Compilation with CEF support

See details about Chromium Embedded Framework

1. Current code tested with CEF3 branch 778, Chromium 148 (June 2026)
2. Download binary code from https://cef-builds.spotifycdn.com/index.html and unpack it in directory without spaces and special symbols:

$ mkdir /d/cef
$ cd /d/cef/
$ wget https://cef-builds.spotifycdn.com/cef_binary_148.0.10%2Bg7ee53f5%2Bchromium-148.0.7778.218_linux64.tar.bz2
$ tar xjf cef_binary_148.0.10+g7ee53f5+chromium-148.0.7778.218_linux64.tar.bz2

3 Install prerequisites - see comments in package CMakeLists.txt. For the linux these are: build-essential, libgtk3.0-dev

1. Compile CEF to produce libcef_dll_wrapper:

$ cd xjf cef_binary_148.0.10+g7ee53f5+chromium-148.0.7778.218_linux64
$ mkdir build
$ cd build
$ cmake ..
$ make -j libcef_dll_wrapper

1. Set CEF_ROOT variable to unpacked directory:

$ export CEF_ROOT=/d/cef/xjf cef_binary_148.0.10+g7ee53f5+chromium-148.0.7778.218_linux64

1. When configure ROOT compilation with cmake -Dwebgui=ON -Dcefweb=ON ..., CEF_ROOT shell variable should be set appropriately. During compilation library $ROOTSYS/lib/libROOTCefDisplay.so and executable $ROOTSYS/bin/cef_main should be created. Also check that several files like icudtl.dat, v8_context_snapshot_blob.bin, snapshot_blob.bin copied into ROOT library directory
2. Run ROOT with --web=cef argument to use CEF web display like:

$ root --web=cef $ROOTSYS/tutorials/hsimple.C

Compile libcef_dll_wrapper on Windows

1. Download binary win32 build like win64
2. Extract in directory without spaces like C:\Soft\cef
3. Modify cmake/cef_variables.cmake to set dynamic linking, replace "/MT" by "/MD" in approx line 389
4. Start "x86 Native tools Command Prompt for VS 2019". Do:

   $ cd C:\Soft\cef
   $ mkdir build
   $ cd build
   $ cmake ..
   $ cmake --build . --config Release --target libcef_dll_wrapper

5. Before compiling ROOT, set CEF_ROOT=C:\Soft\cef variable

Using plain CEF in ROOT batch mode on Linux and Windows

Default CEF builds, provided by https://cef-builds.spotifycdn.com/index.html, now (June 2026) INCLUDES! support of Ozone framework, which allows to run CEF in headless mode on Linux and Windows. So one can run different ROOT macros and tests in batch mode like

$ cd $ROOTSYS/test
$ ./stressGraphics -b --web=cef