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+enable_language
+---------------
+
+Enable a language (CXX/C/Fortran/etc)
+
+::
+
+ enable_language(<lang> [OPTIONAL] )
+
+This command enables support for the named language in CMake. This is
+the same as the project command but does not create any of the extra
+variables that are created by the project command. Example languages
+are CXX, C, Fortran.
+
+This command must be called in file scope, not in a function call.
+Furthermore, it must be called in the highest directory common to all
+targets using the named language directly for compiling sources or
+indirectly through link dependencies. It is simplest to enable all
+needed languages in the top-level directory of a project.
+
+The OPTIONAL keyword is a placeholder for future implementation and
+does not currently work.