Ubuntu LTS build bot is broken after r291270. https://build.webkit.org/#/builders/68/builds/12052/steps/8/logs/stdio /bin/g++-9 -DBUILDING_GTK__=1 -DBUILDING_WEBKIT -DBUILDING_WITH_CMAKE=1 -DBUILDING_WebCore -DGETTEXT_PACKAGE=\"WebKit2GTK-4.0\" -DHAVE_CONFIG_H=1 -DJSC_GLIB_API_ENABLED -DPAS_BMALLOC=1 -DSTATICALLY_LINKED_WITH_PAL -DWEBKITGTK_API_VERSION_STRING=\"4.0\" -I. -IWebCore/DerivedSources ../../Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamer.cpp ../../Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamer.cpp: In lambda function: ../../Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamer.cpp:3102:21: error: there are no arguments to ‘gst_video_format_info_component’ that depend on a template parameter, so a declaration of ‘gst_video_format_info_component’ must be available [-fpermissive] 3102 | gst_video_format_info_component(videoInfo.finfo, i, comp); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Ubuntu LTS build bot uses `jhbuild-minimal.modules` module set. Function `gst_video_format_info_component` is available since GStreamer 1.18. Ubuntu LTS uses GStreamer 1.16 (libgstreamer-plugins-base1.0-dev v1.16.2-4) from system's libraries. If there is no way to work around this issue, a possible solution might be to add `libgstreamer-plugins-base` as a dependency to the minimal moduleset.