After libxfce4ui upgrade to 4.21.x, its pkgconfig moves gtk+-3.0
to Requires.private, so the linker no longer automatically pulls in
libgtk-3. This causes an undefined reference to 'gtk_combo_box_set_model'
when linking xfce-polkit.
Add patch for explicit PKG_CHECK_MODULES for gtk+-3.0 in configure.ac and wire
GTK3_CFLAGS/GTK3_LIBS into src/Makefile.am.
Signed-off-by: Zhang Peng <peng.zhang1.cn@windriver.com>
Signed-off-by: Khem Raj <khem.raj@oss.qualcomm.com>
