$ cat /etc/apt/sources.list.d/diablo-hacking.list
deb http://www.users.on.net/~toojays/maemo-development/jessie/ /
deb-src http://www.users.on.net/~toojays/maemo-development/jessie/ /

$ sudo apt-get install diablo-gcc-5
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following extra packages will be installed:
  diablo-root libgmp10 libmpc3 libmpfr4
Suggested packages:
  diablo-package-tools
The following NEW packages will be installed:
  diablo-gcc-5 diablo-root libgmp10 libmpc3 libmpfr4
0 upgraded, 5 newly installed, 0 to remove and 1 not upgraded.
Need to get 116 MB of archives.
After this operation, 604 MB of additional disk space will be used.
Do you want to continue? [Y/n] y
WARNING: The following packages cannot be authenticated!
  diablo-root diablo-gcc-5
Install these packages without verification? [y/N] y
...

$ cat hello.cpp 
#include <iostream>

int main ()
{
  std::cout << "Hello World! (built with compiler version " << __VERSION__ << ")\n";
  return 0;
}

$ /opt/diablo/gcc-5/bin/arm-none-linux-gnueabi-g++ hello.cpp -o hello
$ file hello
hello: ELF 32-bit LSB executable, ARM, EABI4 version 1 (SYSV), dynamically linked, interpreter /lib/ld-linux.so.3, for GNU/Linux 2.6.8, not stripped

Nokia-N800-23-14:~# ./hello
Hello World! (built with compiler version 5.1.0)

$ sudo apt-get install diablo-package-tools
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following NEW packages will be installed:
  diablo-package-tools
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 311 kB of archives.
After this operation, 1150 kB of additional disk space will be used.
WARNING: The following packages cannot be authenticated!
  diablo-package-tools
Install these packages without verification? [y/N] y
...

$ sudo /opt/diablo/bin/apt-get update
...
$ sudo /opt/diablo/bin/apt-get install libgtkmm-2.4-dev                 
Reading package lists... Done
Building dependency tree... Done
The following extra packages will be installed:
  dbus fontconfig gconf2 gtk20-l10n libatk1.0-0 libatk1.0-dev libcairo2 libcairo2-dev libcairomm-1.0-1 libcairomm-1.0-dev libdbus-1-3
  libdbus-glib-1-2 libexpat1 libexpat1-dev libfontconfig1 libfontconfig1-dev libfreetype6 libfreetype6-dev libgconf2-6 libglib2.0-0
  libglib2.0-data libglib2.0-dev libglibmm-2.4-1c2a libglibmm-2.4-dev libgtk2.0-0 libgtk2.0-bin libgtk2.0-common libgtk2.0-dev
  libgtkmm-2.4-1c2a libice-dev libice6 libjpeg62 libpango1.0-0 libpango1.0-common libpango1.0-dev libpng12-0 libpng12-dev
  libsigc++-2.0-0c2a libsigc++-2.0-dev libsm-dev libsm6 libtiff4 libx11-6 libx11-data libx11-dev libxau-dev libxau6 libxcursor1
  libxdmcp-dev libxdmcp6 libxext-dev libxext6 libxfixes3 libxft-dev libxft2 libxi6 libxml2 libxrandr2 libxrender-dev libxrender1 libxtst6
  pkg-config sgml-base x11-common x11proto-core-dev x11proto-input-dev x11proto-kb-dev x11proto-render-dev x11proto-xext-dev xml-core
  xtrans-dev zlib1g-dev
Suggested packages:
  libcairo2-doc libcairomm-1.0-doc libglib2.0-doc libgtkmm-2.4-doc libgtk2.0-doc ttf-kochi-gothic ttf-kochi-mincho ttf-thryomanes
  ttf-baekmuk ttf-arphic-gbsn00lp ttf-arphic-bsmi00lp ttf-arphic-gkai00mp ttf-arphic-bkai00mp libpango1.0-doc libsigc++-2.0-doc
  libgnome-dev sgml-base-doc
Recommended packages:
  libatk1.0-data x-ttcidfont-conf
The following NEW packages will be installed:
  dbus fontconfig gconf2 gtk20-l10n libatk1.0-0 libatk1.0-dev libcairo2 libcairo2-dev libcairomm-1.0-1 libcairomm-1.0-dev libdbus-1-3
  libdbus-glib-1-2 libexpat1 libexpat1-dev libfontconfig1 libfontconfig1-dev libfreetype6 libfreetype6-dev libgconf2-6 libglib2.0-0
  libglib2.0-data libglib2.0-dev libglibmm-2.4-1c2a libglibmm-2.4-dev libgtk2.0-0 libgtk2.0-bin libgtk2.0-common libgtk2.0-dev
  libgtkmm-2.4-1c2a libgtkmm-2.4-dev libice-dev libice6 libjpeg62 libpango1.0-0 libpango1.0-common libpango1.0-dev libpng12-0
  libpng12-dev libsigc++-2.0-0c2a libsigc++-2.0-dev libsm-dev libsm6 libtiff4 libx11-6 libx11-data libx11-dev libxau-dev libxau6
  libxcursor1 libxdmcp-dev libxdmcp6 libxext-dev libxext6 libxfixes3 libxft-dev libxft2 libxi6 libxml2 libxrandr2 libxrender-dev
  libxrender1 libxtst6 pkg-config sgml-base x11-common x11proto-core-dev x11proto-input-dev x11proto-kb-dev x11proto-render-dev
  x11proto-xext-dev xml-core xtrans-dev zlib1g-dev
0 upgraded, 73 newly installed, 0 to remove and 2 not upgraded.
Need to get 23.0 MB of archives.
After this operation, 73.4 MB of additional disk space will be used.
Do you want to continue? [Y/n] y
WARNING: The following packages cannot be authenticated!
  x11-common libice6 x11proto-core-dev libice-dev libsm6 libsm-dev libxau6 libxdmcp6 libx11-data libx11-6 libxau-dev libxdmcp-dev
  x11proto-input-dev x11proto-kb-dev xtrans-dev libx11-dev libxext6 x11proto-xext-dev libxext-dev libxfixes3 libexpat1 libfreetype6
  libfontconfig1 libxrender1 libxft2 zlib1g-dev libfreetype6-dev libexpat1-dev libfontconfig1-dev x11proto-render-dev libxrender-dev
  libxft-dev libdbus-1-3 dbus libglib2.0-0 libdbus-glib-1-2 libxml2 libgconf2-6 gconf2 fontconfig gtk20-l10n libatk1.0-0 pkg-config
  libglib2.0-dev libatk1.0-dev libpng12-0 libcairo2 libpng12-dev libcairo2-dev libcairomm-1.0-1 libcairomm-1.0-dev libglib2.0-data
  libsigc++-2.0-0c2a libglibmm-2.4-1c2a libsigc++-2.0-dev libglibmm-2.4-dev libgtk2.0-common libpango1.0-common libpango1.0-0 libxcursor1
  libxi6 libxrandr2 libxtst6 libgtk2.0-bin libjpeg62 libtiff4 libgtk2.0-0 libpango1.0-dev libgtk2.0-dev libgtkmm-2.4-1c2a
  libgtkmm-2.4-dev sgml-base xml-core
Install these packages without verification? [y/N] y
...

$ cat simple.cpp 
#include <gtkmm/button.h>
#include <gtkmm/main.h>
#include <gtkmm/window.h>

class Window : public Gtk::Window
{
 private:
  Gtk::Button m_goodbye_button;

 public:
  Window () : m_goodbye_button("Goodbye!")
  {
    set_title("Hello World!");
    add(m_goodbye_button);
    m_goodbye_button.signal_clicked().connect([](){Gtk::Main::quit();});
    show_all_children();
  }

};

int main(int argc, char** argv)
{
  Gtk::Main kit(argc, argv);

  Window helloworld;
  Gtk::Main::run(helloworld);

  return 0;
}

$ cat Makefile 
CXX := /opt/diablo/gcc-5/bin/arm-none-linux-gnueabi-g++
CXXFLAGS := -std=c++11 -Os

# Tell pkg-config to look in our Diablo sysroot.
PKG_CONFIG := PKG_CONFIG_LIBDIR=/opt/diablo/root/usr/lib/pkgconfig \
              PKG_CONFIG_SYSROOT_DIR=/opt/diablo/root pkg-config

CXXFLAGS += $(shell $(PKG_CONFIG) gtkmm-2.4 --cflags)
LDLIBS := $(shell $(PKG_CONFIG) gtkmm-2.4 --libs)

# gtkmm-2.4 uses auto_ptr, which is deprecated in C++11.
# Silence warnings about that.
CXXFLAGS += -Wno-deprecated-declarations

# GCC complains that libsigc++-2.0 keeps changing the meaning of
# slot_list.  The following flag downgrades that error to a warning. An
# alternate solution is to comment out the line about
# SIGC_TYPEDEF_REDEFINE_ALLOWED in
# /opt/diablo/root/usr/include/sigc++-2.0/sigc++/signal.h. That has the
# benefit of eliminating the error/warning altogether.
CXXFLAGS += -fpermissive

simple: simple.o
	$(CXX) -o $@ $^ $(LDLIBS)

clean:
	-rm -f simple simple.o

.PHONY: clean