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diff --git a/Modules/CheckFortranCompilerFlag.cmake b/Modules/CheckFortranCompilerFlag.cmake
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+++ b/Modules/CheckFortranCompilerFlag.cmake
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+#.rst:
+# CheckFortranCompilerFlag
+# ------------------------
+#
+# Check whether the Fortran compiler supports a given flag.
+#
+# CHECK_Fortran_COMPILER_FLAG(<flag> <var>)
+#
+# ::
+#
+#   <flag> - the compiler flag
+#   <var>  - variable to store the result
+#            Will be created as an internal cache variable.
+#
+# This internally calls the check_fortran_source_compiles macro and
+# sets CMAKE_REQUIRED_DEFINITIONS to <flag>.  See help for
+# CheckFortranSourceCompiles for a listing of variables that can
+# otherwise modify the build.  The result only tells that the compiler
+# does not give an error message when it encounters the flag.  If the
+# flag has any effect or even a specific one is beyond the scope of
+# this module.
+
+#=============================================================================
+# Copyright 2015 Nicolas Bock <nicolasbock@gmail.com>
+# Copyright 2006-2011 Kitware, Inc.
+# Copyright 2006 Alexander Neundorf <neundorf@kde.org>
+# Copyright 2011 Matthias Kretz <kretz@kde.org>
+#
+# Distributed under the OSI-approved BSD License (the "License");
+# see accompanying file Copyright.txt for details.
+#
+# This software is distributed WITHOUT ANY WARRANTY; without even the
+# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+# See the License for more information.
+#=============================================================================
+# (To distribute this file outside of CMake, substitute the full
+#  License text for the above reference.)
+
+include(CheckFortranSourceCompiles)
+include(CMakeCheckCompilerFlagCommonPatterns)
+
+macro (CHECK_Fortran_COMPILER_FLAG _FLAG _RESULT)
+  set(SAFE_CMAKE_REQUIRED_DEFINITIONS "${CMAKE_REQUIRED_DEFINITIONS}")
+  set(CMAKE_REQUIRED_DEFINITIONS "${_FLAG}")
+
+  # Normalize locale during test compilation.
+  set(_CheckFortranCompilerFlag_LOCALE_VARS LC_ALL LC_MESSAGES LANG)
+  foreach(v ${_CheckFortranCompilerFlag_LOCALE_VARS})
+    set(_CheckFortranCompilerFlag_SAVED_${v} "$ENV{${v}}")
+    set(ENV{${v}} C)
+  endforeach()
+  CHECK_COMPILER_FLAG_COMMON_PATTERNS(_CheckFortranCompilerFlag_COMMON_PATTERNS)
+  CHECK_Fortran_SOURCE_COMPILES("       program test\n       stop\n       end program" ${_RESULT}
+    # Some compilers do not fail with a bad flag
+    FAIL_REGEX "command line option .* is valid for .* but not for Fortran" # GNU
+    ${_CheckFortranCompilerFlag_COMMON_PATTERNS}
+    )
+  foreach(v ${_CheckFortranCompilerFlag_LOCALE_VARS})
+    set(ENV{${v}} ${_CheckFortranCompilerFlag_SAVED_${v}})
+    unset(_CheckFortranCompilerFlag_SAVED_${v})
+  endforeach()
+  unset(_CheckFortranCompilerFlag_LOCALE_VARS)
+  unset(_CheckFortranCompilerFlag_COMMON_PATTERNS)
+
+  set (CMAKE_REQUIRED_DEFINITIONS "${SAFE_CMAKE_REQUIRED_DEFINITIONS}")
+endmacro ()