Something

cvs -d :pserver:anonymous@cvs-mirror.mozilla.org:/cvsroot co  -r MOZILLA_1_8_BRANCH mozilla/client.mk
cd mozilla ; cp ../mozconfig .mozconfig
make -f client.mk checkout MOZ_CO_PROJECT=calendar,mail
make -f client.mk build

.mozconfig:
ac_add_options --disable-optimize
ac_add_options --enable-debug
ac_add_options --enable-default-toolkit=cairo-gtk2
ac_add_options --disable-javaxpcom
ac_add_options --enable-debugger-info-modules=yes
ac_add_options --enable-extensions=default,lightning,inspector
mk_add_options MOZ_OBJDIR=@TOPSRCDIR@/obj-@CONFIG_GUESS@
mk_add_options MOZ_BUILD_PROJECTS="calendar mail"
mk_add_options MOZ_CO_PROJECT="calendar mail"
ac_add_app_options calendar --enable-application=calendar
ac_add_app_options mail --enable-application=mail

c++ -o nsCairoDeviceContext.o -c -fvisibility=hidden -DMOZILLA_INTERNAL_API -DOSTYPE=\"Linux2.6.18.8-0\" -DOSARCH=\"Linux\" -DBUILD_ID=0000000000 -DMOZ_ENABLE_GTK2 -I/home/russell/mozilla/gfx/src/cairo/. -I/home/russell/mozilla/gfx/src/cairo/.. -I/home/russell/mozilla/gfx/src/cairo/../shared  -I../../../dist/include/xpcom -I../../../dist/include/string -I../../../dist/include/cairo -I../../../dist/include/libpixman -I../../../dist/include/gfx -I../../../dist/include/widget -I../../../dist/include/intl -I../../../dist/include/view -I../../../dist/include/pref -I../../../dist/include/uconv -I../../../dist/include/unicharutil -I../../../dist/include/locale -I../../../dist/include/necko -I../../../dist/include/content -I../../../dist/include/layout -I../../../dist/include/dom -I../../../dist/include/debug -I../../../dist/include/imglib2 -I../../../dist/include/zlib -I../../../dist/include/gfx -I../../../dist/include -I../../../dist/include/nspr    -I../../../dist/sdk/include    -fPIC   -fno-rtti -fno-exceptions -Wall -Wconversion -Wpointer-arith -Wcast-align -Woverloaded-virtual -Wsynth -Wno-ctor-dtor-privacy -Wno-non-virtual-dtor -Wno-long-long -pedantic -fshort-wchar -pthread -pipe  -DDEBUG -D_DEBUG -DDEBUG_russell -DTRACING -g -fno-inline -I/usr/include/cairo -I/usr/include/freetype2 -I/usr/include/libpng12 -I/opt/gnome/include/gtk-2.0 -I/opt/gnome/lib64/gtk-2.0/include -I/opt/gnome/include/atk-1.0 -I/opt/gnome/include/pango-1.0 -I/opt/gnome/include/glib-2.0 -I/opt/gnome/lib64/glib-2.0/include   -I../../../dist/include/cairo -I/usr/include/freetype2     -DMOZILLA_CLIENT -include ../../../mozilla-config.h -Wp,-MD,.deps/nsCairoDeviceContext.pp /home/russell/mozilla/gfx/src/cairo/nsCairoDeviceContext.cpp
../../../dist/include/gfx/nsIRenderingContext.h:705: warning: ‘virtual nsresult nsIRenderingContext::RetrieveCurrentNativeGraphicData(void**)’ was hidden
/home/russell/mozilla/gfx/src/cairo/nsCairoRenderingContext.h:182: warning:   by ‘virtual nsresult nsCairoRenderingContext::RetrieveCurrentNativeGraphicData(PRUint32*)’
/home/russell/mozilla/gfx/src/cairo/nsCairoDeviceContext.cpp: In function ‘int helpful_error_handler(Display*, XErrorEvent*)’:
/home/russell/mozilla/gfx/src/cairo/nsCairoDeviceContext.cpp:124: warning: format ‘%d’ expects type ‘int’, but argument 3 has type ‘long unsigned int’
/home/russell/mozilla/gfx/src/cairo/nsCairoDeviceContext.cpp: In member function ‘virtual nsresult nsCairoDeviceContext::CreateRenderingContextInstance(nsIRenderingContext*&)’:
/home/russell/mozilla/gfx/src/cairo/nsCairoDeviceContext.cpp:227: error: cannot allocate an object of abstract type ‘nsCairoRenderingContext’
/home/russell/mozilla/gfx/src/cairo/nsCairoRenderingContext.h:64: note:   because the following virtual functions are pure within ‘nsCairoRenderingContext’:
../../../dist/include/gfx/nsIRenderingContext.h:705: note:      virtual nsresult nsIRenderingContext::RetrieveCurrentNativeGraphicData(void**)
gmake[6]: *** [nsCairoDeviceContext.o] Error 1
gmake[6]: Leaving directory `/home/russell/mozilla/obj-x86_64-unknown-linux-gnu/calendar/gfx/src/cairo'
gmake[5]: *** [libs] Error 2