make_gobject_introspection_find_gir_files() {
    # required for .typelib files, eg mypaint git version
    if [ -d "$1/lib/girepository-1.0" ]; then
      addToSearchPath GI_TYPELIB_PATH $1/lib/girepository-1.0
    fi

    # XDG_DATA_DIRS: required for finding .gir files
    if [ -d "$1/share/gir-1.0" ]; then
      addToSearchPath XDG_DATA_DIRS $1/share
    fi
}

export_gobject_introspection_fallback_path() {
    # Newer multiple-output-optimized stdenv has a variable $outputLib,
    # which in turn specifies another variable which then is used as
    # the destination for the library contents (${!outputLib}/lib).
    # We export this so it is available to subprocesses, such as giscanner,
    # which we patch to prioritize this variable if available.
    export NIX_GOBJECT_INTROSPECTION_DEFAULT_FALLBACK_LIBPATH=${!outputLib}
}

addEnvHooks "$targetOffset" make_gobject_introspection_find_gir_files
addEnvHooks "$targetOffset" export_gobject_introspection_fallback_path

giDiscoverSelf() {
    if [ -d "$prefix/lib/girepository-1.0" ]; then
      addToSearchPath GI_TYPELIB_PATH $prefix/lib/girepository-1.0
    fi
}

# gappsWrapperArgsHook expects GI_TYPELIB_PATH variable to be set by this.
# Until we have dependency mechanism in generic builder, we need to use this hack.
postInstallHooks+=(giDiscoverSelf)

_multioutMoveGlibGir() {
  moveToOutput share/gir-1.0 "${!outputDev}"
}

preFixupHooks+=(_multioutMoveGlibGir)