################################################################################
  #
  # libgtk3
  #
  ################################################################################
  
  LIBGTK3_VERSION_MAJOR = 3.20
  LIBGTK3_VERSION = $(LIBGTK3_VERSION_MAJOR).6
  LIBGTK3_SOURCE = gtk+-$(LIBGTK3_VERSION).tar.xz
  LIBGTK3_SITE = http://ftp.gnome.org/pub/gnome/sources/gtk+/$(LIBGTK3_VERSION_MAJOR)
  LIBGTK3_LICENSE = LGPLv2+
  LIBGTK3_LICENSE_FILES = COPYING
  LIBGTK3_INSTALL_STAGING = YES
  LIBGTK3_AUTORECONF = YES
  
  LIBGTK3_CONF_ENV = \
  	ac_cv_path_GTK_UPDATE_ICON_CACHE=$(HOST_DIR)/usr/bin/gtk-update-icon-cache \
  	ac_cv_path_GDK_PIXBUF_CSOURCE=$(HOST_DIR)/usr/bin/gdk-pixbuf-csource \
  	PKG_CONFIG_FOR_BUILD=$(HOST_DIR)/usr/bin/pkgconf
  
  LIBGTK3_CONF_OPTS = \
  	--disable-glibtest \
  	--enable-explicit-deps=no \
  	--enable-gtk2-dependency \
  	--disable-introspection
  
  # Override pkg-config pkgdatadir variable, it needs the prefix
  LIBGTK3_MAKE_OPTS = \
  	WAYLAND_PROTOCOLS_DATADIR=$(STAGING_DIR)/usr/share/wayland-protocols
  
  LIBGTK3_DEPENDENCIES = host-pkgconf host-libgtk3 atk libglib2 cairo pango gdk-pixbuf libepoxy
  
  ifeq ($(BR2_PACKAGE_LIBGTK3_X11),y)
  LIBGTK3_DEPENDENCIES += fontconfig xlib_libX11 xlib_libXext xlib_libXrender xlib_libXi
  
  LIBGTK3_CONF_OPTS += \
  	--enable-x11-backend \
  	--x-includes=$(STAGING_DIR)/usr/include/X11 \
  	--x-libraries=$(STAGING_DIR)/usr/lib
  else
  LIBGTK3_CONF_OPTS += --disable-x11-backend
  endif
  
  ifeq ($(BR2_PACKAGE_LIBGTK3_WAYLAND),y)
  LIBGTK3_DEPENDENCIES += wayland wayland-protocols libxkbcommon
  LIBGTK3_CONF_OPTS += --enable-wayland-backend
  else
  LIBGTK3_CONF_OPTS += --disable-wayland-backend
  endif
  
  ifeq ($(BR2_PACKAGE_LIBGTK3_BROADWAY),y)
  LIBGTK3_CONF_OPTS += --enable-broadway-backend
  else
  LIBGTK3_CONF_OPTS += --disable-broadway-backend
  endif
  
  ifeq ($(BR2_PACKAGE_XLIB_LIBXINERAMA),y)
  LIBGTK3_CONF_OPTS += --enable-xinerama
  LIBGTK3_DEPENDENCIES += xlib_libXinerama
  else
  LIBGTK3_CONF_OPTS += --disable-xinerama
  endif
  
  ifeq ($(BR2_PACKAGE_XLIB_LIBXRANDR),y)
  LIBGTK3_CONF_OPTS += --enable-xrandr
  LIBGTK3_DEPENDENCIES += xlib_libXrandr
  else
  LIBGTK3_CONF_OPTS += --disable-xrandr
  endif
  
  ifeq ($(BR2_PACKAGE_XLIB_LIBXCURSOR),y)
  LIBGTK3_DEPENDENCIES += xlib_libXcursor
  endif
  
  ifeq ($(BR2_PACKAGE_XLIB_LIBXFIXES),y)
  LIBGTK3_CONF_OPTS += --enable-xfixes
  LIBGTK3_DEPENDENCIES += xlib_libXfixes
  else
  LIBGTK3_CONF_OPTS += --disable-xfixes
  endif
  
  ifeq ($(BR2_PACKAGE_XLIB_LIBXCOMPOSITE),y)
  LIBGTK3_CONF_OPTS += --enable-xcomposite
  LIBGTK3_DEPENDENCIES += xlib_libXcomposite
  else
  LIBGTK3_CONF_OPTS += --disable-xcomposite
  endif
  
  ifeq ($(BR2_PACKAGE_XLIB_LIBXDAMAGE),y)
  LIBGTK3_CONF_OPTS += --enable-xdamage
  LIBGTK3_DEPENDENCIES += xlib_libXdamage
  else
  LIBGTK3_CONF_OPTS += --disable-xdamage
  endif
  
  ifeq ($(BR2_PACKAGE_XLIB_LIBXKBFILE),y)
  LIBGTK3_CONF_OPTS += --enable-xkb
  LIBGTK3_DEPENDENCIES += xlib_libxkbfile
  else
  LIBGTK3_CONF_OPTS += --disable-xkb
  endif
  
  ifeq ($(BR2_PACKAGE_CUPS),y)
  LIBGTK3_CONF_OPTS += --enable-cups
  LIBGTK3_CONF_ENV += ac_cv_path_CUPS_CONFIG=$(STAGING_DIR)/usr/bin/cups-config
  LIBGTK3_DEPENDENCIES += cups
  else
  LIBGTK3_CONF_OPTS += --disable-cups
  endif
  
  ifeq ($(BR2_PACKAGE_LIBGTK3_DEMO),y)
  LIBGTK3_DEPENDENCIES += hicolor-icon-theme shared-mime-info
  else
  define LIBGTK3_REMOVE_DEMOS
  	$(RM) $(TARGET_DIR)/usr/bin/gtk3-demo \
  		$(TARGET_DIR)/usr/bin/gtk3-demo-application
  endef
  LIBGTK3_POST_INSTALL_TARGET_HOOKS += LIBGTK3_REMOVE_DEMOS
  endif
  
  ifeq ($(BR2_PACKAGE_LIBGTK3_TESTS),y)
  LIBGTK3_CONF_OPTS += --enable-installed-tests
  else
  LIBGTK3_CONF_OPTS += --disable-installed-tests
  endif
  
  define LIBGTK3_COMPILE_GLIB_SCHEMAS
  	$(HOST_DIR)/usr/bin/glib-compile-schemas \
  		$(TARGET_DIR)/usr/share/glib-2.0/schemas
  endef
  
  LIBGTK3_POST_INSTALL_TARGET_HOOKS += LIBGTK3_COMPILE_GLIB_SCHEMAS
  
  # gtk+ >= 3.10 can build a native version of gtk-update-icon-cache if
  # --enable-gtk2-dependency=no is set when invoking './configure'.
  #
  # Unfortunately, if the target toolchain is based on uClibc, the macro
  # AM_GLIB_GNU_GETTEXT will detect the libintl built for the target and
  # will add '-lintl' to the default list of libraries for the linker (used
  # for both native and target builds).
  #
  # But no native version of libintl is available (the functions are
  # provided by glibc). So gtk-update-icon-cache will not build.
  #
  # As a workaround, we build gtk-update-icon-cache on our own, set
  # --enable-gtk2-dependency=yes and force './configure' to use our version.
  
  HOST_LIBGTK3_DEPENDENCIES = \
  	host-libglib2 \
  	host-libpng \
  	host-gdk-pixbuf \
  	host-pkgconf \
  	host-librsvg
  
  HOST_LIBGTK3_CFLAGS = \
  	`$(HOST_DIR)/usr/bin/pkgconf --cflags --libs gdk-pixbuf-2.0` \
  	`$(HOST_DIR)/usr/bin/pkgconf --cflags --libs gio-2.0`
  
  define HOST_LIBGTK3_CONFIGURE_CMDS
  	echo "#define GETTEXT_PACKAGE \"gtk30\"" >> $(@D)/gtk/config.h
  	echo "#define HAVE_UNISTD_H 1" >> $(@D)/gtk/config.h
  	echo "#define HAVE_FTW_H 1" >> $(@D)/gtk/config.h
  endef
  
  define HOST_LIBGTK3_BUILD_CMDS
  	$(HOSTCC) $(HOST_CFLAGS) $(HOST_LDFLAGS) \
  		$(@D)/gtk/updateiconcache.c \
  		$(HOST_LIBGTK3_CFLAGS) \
  		-o $(@D)/gtk/gtk-update-icon-cache
  	$(HOSTCC) $(HOST_CFLAGS) $(HOST_LDFLAGS) \
  		$(@D)/gtk/encodesymbolic.c \
  		$(HOST_LIBGTK3_CFLAGS) \
  		-o $(@D)/gtk/gtk-encode-symbolic-svg
  endef
  
  define HOST_LIBGTK3_INSTALL_CMDS
  	$(INSTALL) -D -m 0755 $(@D)/gtk/gtk-update-icon-cache \
  		$(HOST_DIR)/usr/bin/gtk-update-icon-cache
  	$(INSTALL) -D -m 0755 $(@D)/gtk/gtk-encode-symbolic-svg \
  		$(HOST_DIR)/usr/bin/gtk-encode-symbolic-svg
  endef
  
  # Create icon-theme.cache for each of the icon directories/themes
  # It's not strictly necessary but speeds up lookups
  define LIBGTK3_UPDATE_ICON_CACHE
  	find $(TARGET_DIR)/usr/share/icons -maxdepth 1 -mindepth 1 -type d \
  		-exec $(HOST_DIR)/usr/bin/gtk-update-icon-cache {} \;
  endef
  LIBGTK3_TARGET_FINALIZE_HOOKS += LIBGTK3_UPDATE_ICON_CACHE
  
  $(eval $(autotools-package))
  $(eval $(host-autotools-package))