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-rw-r--r--Help/variable/CMAKE_SYSTEM_VERSION.rst8
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diff --git a/Help/variable/CMAKE_SYSTEM_VERSION.rst b/Help/variable/CMAKE_SYSTEM_VERSION.rst
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--- a/Help/variable/CMAKE_SYSTEM_VERSION.rst
+++ b/Help/variable/CMAKE_SYSTEM_VERSION.rst
@@ -1,8 +1,8 @@
CMAKE_SYSTEM_VERSION
--------------------
-OS version CMake is building for.
+The OS version CMake is building for.
-A numeric version string for the system, on systems that support
-uname, this variable is set to the output of uname -r. On other
-systems this is set to major-minor version numbers.
+This variable is the same as :variable:`CMAKE_HOST_SYSTEM_VERSION` if
+you build for the host system instead of the target system when
+cross compiling.