Update CMakeLists.txt - install cmake config files alongside other projects

CMakeLists.txt

@@ -112,6 +112,7 @@ install(EXPORT "${PROJECT_NAME}Targets"
 )
 
 include(CMakePackageConfigHelpers)
+set(FGGL_CONFIG_PATH "${CMAKE_INSTALL_LIBDIR}/cmake/fggl")
 
 # generate the version file for the config file
 write_basic_package_version_file(
@@ -121,13 +122,13 @@ write_basic_package_version_file(
 )
 configure_package_config_file(${CMAKE_CURRENT_SOURCE_DIR}/Config.cmake.in
     "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Config.cmake"
-    INSTALL_DESTINATION cmake
+    INSTALL_DESTINATION "${FGGL_CONFIG_PATH}"
 )
 # install config files
 install(FILES
     "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Config.cmake"
     "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake"
-    DESTINATION cmake
+    DESTINATION "${FGGL_CONFIG_PATH}"
 )
 # generate the export targets for the build tree
 export(EXPORT "${PROJECT_NAME}Targets"
@@ -136,7 +137,7 @@ export(EXPORT "${PROJECT_NAME}Targets"
 )
 
 install(TARGETS ${PROJECT_NAME}
-  EXPORT ${PROJECT_NAME}Targets
+  DESTINATION "${FGGL_CONFIG_PATH}"
   PUBLIC_HEADER DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/${PROJECT_NAME}
   INCLUDES DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
 )