Compatibility with CMake < 2.8.12 will be removed from a future version of CMake.
According to our test images all supported distributions have CMake > 3
Signed-off-by: Thomas Lauf <thomas.lauf@tngtech.com>
- Using a separate build directory currently fails during make install
because none of the files under doc/holidays or doc/themes are being
by cmake into the build dir. Add CMakeLists.txt files for both
doc/holidays and doc/themes, and add the corresponding add_subdirectory
directives to doc/CMakeLists.txt, to ensure these files are always
copied into the build directory and installed correctly.