Gentoo Packages

dev-util/electron: Use system libpng instead of the bundled one
mail-client/thunderbird: Use the system-wide <pkg>media-libs/libpng</pkg> instead of bundled (requires APNG patches)
www-client/chromium: Use system <pkg>media-libs/libpng</pkg> instead of the bundled library
www-client/cromite: Use system libpng instead of the bundled one
www-client/firefox: Use the system-wide <pkg>media-libs/libpng</pkg> instead of bundled (requires APNG patches)
www-client/icecat: Use the system-wide <pkg>media-libs/libpng</pkg> instead of bundled (requires APNG patches)
www-client/librewolf: Use the system-wide <pkg>media-libs/libpng</pkg> instead of bundled (requires APNG patches)
www-client/seamonkey: Use the system-wide <pkg>media-libs/libpng</pkg> instead of bundled (requires APNG patches)
www-client/torbrowser: Use the system-wide <pkg>media-libs/libpng</pkg> instead of bundled (requires APNG patches)
www-client/ungoogled-chromium: Use system libpng instead of the bundled one

mail-client/thunderbird: Use the system-wide media-libs/libpng instead of bundled (requires APNG patches)
www-client/firefox: Use the system-wide media-libs/libpng instead of bundled (requires APNG patches)
www-client/seamonkey: Use the system-wide media-libs/libpng instead of bundled (requires APNG patches)
www-client/torbrowser: Use the system-wide media-libs/libpng instead of bundled (requires APNG patches)

Warning: USE flag 'system-png' is used in ebuilds/metadata but is not defined in profiles/use.desc

Package	Local Description (use.local.desc)	Metadata Description (metadata.xml)
www-client/torbrowser	Use the system-wide media-libs/libpng instead of bundled (requires APNG patches)	Use the system-wide <pkg>media-libs/libpng</pkg> instead of bundled (requires APNG patches)
www-client/firefox	Use the system-wide media-libs/libpng instead of bundled (requires APNG patches)	Use the system-wide <pkg>media-libs/libpng</pkg> instead of bundled (requires APNG patches)
mail-client/thunderbird	Use the system-wide media-libs/libpng instead of bundled (requires APNG patches)	Use the system-wide <pkg>media-libs/libpng</pkg> instead of bundled (requires APNG patches)
dev-util/electron	-	Use system libpng instead of the bundled one
www-client/seamonkey	Use the system-wide media-libs/libpng instead of bundled (requires APNG patches)	Use the system-wide <pkg>media-libs/libpng</pkg> instead of bundled (requires APNG patches)
www-client/librewolf	-	Use the system-wide <pkg>media-libs/libpng</pkg> instead of bundled (requires APNG patches)
www-client/chromium	-	Use system <pkg>media-libs/libpng</pkg> instead of the bundled library
www-client/icecat	-	Use the system-wide <pkg>media-libs/libpng</pkg> instead of bundled (requires APNG patches)
www-client/cromite	-	Use system libpng instead of the bundled one
www-client/ungoogled-chromium	-	Use system libpng instead of the bundled one

USE Flag: system-png