This follows libebml's recent bump to C++14.
include(GNUInstallDirs)
-set(CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD 14)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(libmatroska_SOURCES
## Building and installing the library
-libmatroska is based on `cmake`. It requires a C++ compiler as well as
+libmatroska is based on `cmake`. It requires a C++ compiler compatible
+with the C++14 standard as well as
[libebml](https://github.com/Matroska-Org/libebml). This means that
the normal build process consists of the usual steps: