diff --git a/dev-util/cmake/files/50cmake-gentoo.el b/dev-util/cmake/files/50cmake-gentoo.el
new file mode 100644
--- /dev/null
+++ b/dev-util/cmake/files/50cmake-gentoo.el
@@ -0,0 +1,4 @@
+(add-to-list 'load-path "@SITELISP@")
+(autoload 'cmake-mode "cmake-mode" "Major mode for editing CMake files." t)
+(add-to-list 'auto-mode-alist '("CMakeLists\\.txt\\'" . cmake-mode))
+(add-to-list 'auto-mode-alist '("\\.cmake\\'" . cmake-mode))