tce-load -i intltool gtk3-dev gobject-introspection-dev dconf-dev gsettings-desktop-schemas libnotify-dev iso-codes

note: configure script needs gtk2 and GConf gsettings-schema-convert (borrow from debian)

cd ibus-1.5.5

CC="gcc -flto -fuse-linker-plugin -mtune=generic -Os -pipe" CXX="g++ -flto -fuse-linker-plugin -mtune=generic -Os -pipe" ./configure --prefix=/usr/local --disable-static --libexecdir=/usr/local/lib/ibus --disable-gtk2 --enable-gtk3 --disable-gconf

find . -name Makefile -type f -exec sed -i 's/-O2/ /g' {} \;

make
sudo make install

Build options:
  Version                   1.5.5
  Install prefix            /usr/local
  Build shared libs         yes
  Build static libs         no
  CFLAGS                    -g -O2
  Gtk2 immodule dir         
  Gtk3 immodule dir         ${exec_prefix}/lib/gtk-3.0/3.0.0/immodules
  Build gtk2 immodule       no (disabled, use --enable-gtk2 to enable)
  Build gtk3 immodule       yes
  Build XIM agent server    yes
  Build wayland support     no (disabled, use --enable-wayland to enable)
  Build python library      no (disabled, use --enable-python-library to enable)
  Build gconf modules       no (disabled, use --enable-gconf to enable)
  Build memconf modules     no
  Build dconf modules       yes (enabled, use --disable-dconf to disable)
  Build introspection       yes
  IBus-1.0.gir scannerflags "--warn-all --identifier-prefix=IBus --symbol-prefix=ibus"
  Build vala binding        no
  Build document            no (disabled, use --enable-gtk-doc to enable)
  Build UI                  yes (enabled, use --disable-ui to disable)
  Build engine              yes (enabled, use --disable-engine to disable)
  Enable key snooper        yes
  No snooper regexes        ".*chrome.*,.*chromium.*,firefox.*,Do.*"
  Panel icon                "ibus-keyboard"
  Enable surrounding-text   yes
  Enable libnotify          yes (enabled, use --disable-libnotify to disable)
  Run test cases            yes