The patch provided by Bill Binder on Gentoo bugzilla[1]; it:
- Removes bundled tinyxml2
- Removes mimedb actions from build

[1]: https://bugs.gentoo.org/903035
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 43ba5ede..5a6d1c3f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -31,6 +31,8 @@ option(WXFB_ENABLE_EXTRA_CHECKS "Enable additional static code analysis." OFF)
 # TODO: Currently generator languages cannot be configured
 set(WXFB_GENERATOR_LANGUAGES cpp python lua php CACHE INTERNAL "")
 
+find_package(TINYXML2 REQUIRED)
+
 # Adjust paths to match wxStandardPaths implementation, use own cache variables to share across CMake scopes
 include(GNUInstallDirs)
 if(WIN32)
@@ -103,9 +105,6 @@ add_subdirectory(plugins)
 add_subdirectory(sdk)
 add_subdirectory(third_party/md5)
 add_subdirectory(third_party/stack_trace)
-stash_variable(BUILD_SHARED_LIBS ${WXFB_TINYXML2_SHARED})
-add_subdirectory(third_party/tinyxml2 EXCLUDE_FROM_ALL)
-restore_variable(BUILD_SHARED_LIBS)
 
 if(NOT WXFB_BUILD_PLUGIN_HOST)
   wxfb_configure_postbuild()
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index dfd612d2..d13907b3 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -280,14 +280,6 @@ if(NOT WIN32 AND NOT APPLE)
     DIRECTORY "${PROJECT_SOURCE_DIR}/data/platform/linux/share/"
     DESTINATION ${CMAKE_INSTALL_DATAROOTDIR}
   )
-  install(
-    CODE
-    "
-      find_program(update-mime-database_cmd NAMES update-mime-database REQUIRED)
-      mark_as_advanced(update-mime-database_cmd)
-      execute_process(COMMAND \"\${update-mime-database_cmd}\" \"\${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_DATAROOTDIR}/mime\")
-    "
-  )
 endif()
 
 if(WIN32)