Help/guide: fix MathFunctionsTargets.cmake path in importing-exporting

It is using ${CMAKE_INSTALL_LIBDIR} and an extra "/MathFunctions" path
suffix since these commits:
- e58a76de51 Help/guide: fix importing-exporting CMake install destinations
- 26cf661b64 Help/guide: use GNUInstallDirs in importing-exporting example

1 files changed, 5 insertions, 4 deletions

diff --git a/Help/guide/importing-exporting/index.rst b/Help/guide/importing-exporting/index.rst
index 51a09c0..b1812c1 100644
--- a/Help/guide/importing-exporting/index.rst
+++ b/Help/guide/importing-exporting/index.rst
@@ -285,9 +285,9 @@ command.
   :end-before: # include CMakePackageConfigHelpers macro
 
 This command generates the ``MathFunctionsTargets.cmake`` file and arranges
-to install it to ``lib/cmake``. The file contains code suitable for
-use by downstreams to import all targets listed in the install command from
-the installation tree.
+to install it to ``${CMAKE_INSTALL_LIBDIR}/cmake/MathFunctions``. The file
+contains code suitable for use by downstreams to import all targets listed in
+the install command from the installation tree.
 
 The ``NAMESPACE`` option will prepend ``MathFunctions::`` to  the target names
 as they are written to the export file. This convention of double-colons
@@ -317,7 +317,8 @@ were built in its own tree. For example:
 .. code-block:: cmake
   :linenos:
 
-   include(${INSTALL_PREFIX}/lib/cmake/MathFunctionTargets.cmake)
+   include(GNUInstallDirs)
+   include(${INSTALL_PREFIX}/${CMAKE_INSTALL_LIBDIR}/cmake/MathFunctions/MathFunctionTargets.cmake)
    add_executable(myexe src1.c src2.c )
    target_link_libraries(myexe PRIVATE MathFunctions::MathFunctions)