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diff --git a/Modules/FindMsys.cmake b/Modules/FindMsys.cmake
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+# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+# file Copyright.txt or https://cmake.org/licensing for details.
+
+#[=======================================================================[.rst:
+FindMsys
+--------
+
+.. versionadded:: 3.21
+
+Find MSYS, a POSIX-compatible environment that runs natively
+on Microsoft Windows
+#]=======================================================================]
+
+if (WIN32)
+  if(MSYS_INSTALL_PATH)
+    set(MSYS_CMD "${MSYS_INSTALL_PATH}/msys2_shell.cmd")
+  endif()
+
+  find_program(MSYS_CMD
+    NAMES msys2_shell.cmd
+    PATHS
+      "C:/msys64"
+      "C:/msys32"
+      "C:/MSYS"
+      "[HKEY_LOCAL_MACHINE\\SOFTWARE\\MSYS\\setup;rootdir]"
+      "[HKEY_LOCAL_MACHINE\\SOFTWARE\\Cygnus Solutions\\MSYS\\mounts v2\\/;native]"
+  )
+  get_filename_component(MSYS_INSTALL_PATH "${MSYS_CMD}" DIRECTORY)
+  mark_as_advanced(MSYS_CMD)
+
+endif ()