Comment 10 for bug 916477

Here's a (verbose) build with the following patch added to lightdm:

Index: lightdm-1.1.1/liblightdm-gobject/liblightdm-gobject-1.pc.in
===================================================================
--- lightdm-1.1.1.orig/liblightdm-gobject/liblightdm-gobject-1.pc.in 2012-01-17 06:44:03.000000000 +0100
+++ lightdm-1.1.1/liblightdm-gobject/liblightdm-gobject-1.pc.in 2012-01-31 07:50:32.516042389 +0100
@@ -6,6 +6,7 @@
 Name: liblightdm-gobject
 Description: LightDM client library
 Version: @VERSION@
-Requires.private: glib-2.0 gio-2.0 gio-unix-2.0 gobject-2.0 libxklavier x11
+Requires.private: glib-2.0 gio-unix-2.0 gobject-2.0 libxklavier x11
+Requires: gio-2.0
 Libs: -L${libdir} -llightdm-gobject-1
 Cflags: -I${includedir}/lightdm-gobject-1

Extract from the relevant build lines:

/bin/bash ../libtool --tag=CC --mode=link gcc -DGETTEXT_PACKAGE=\"lightdm-gtk-greeter\" -DLOCALEDIR=\""/usr/share/locale"\" -DGREETER_DATA_DIR=\"""\" -DCONFIG_FILE=\""/lightdm-gtk-greeter.conf"\" -DGSEAL_ENABLE -pthread -I/usr/include/gtk-3.0 -I/usr/include/atk-1.0 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/pango-1.0 -I/usr/include/gio-unix-2.0/ -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include -I/usr/include/pixman-1 -I/usr/include/freetype2 -I/usr/include/libpng12 -I/usr/include/lightdm-gobject-1 -I/usr/include/cairo -I/usr/include/libxml2 -Wall -Wmissing-prototypes -Wnested-externs -Wpointer-arith -Wno-sign-compare -g -O2 -fPIE -fstack-protector --param=ssp-buffer-size=4 -Wformat -Wformat-security -Werror=format-security -fPIE -pie -Wl,-z,relro -Wl,-z,now -Wl,--as-needed -Wl,-O1 -o lightdm-gtk-greeter lightdm_gtk_greeter-lightdm-gtk-greeter.o -pthread -Wl,--export-dynamic -lgtk-3 -lgdk-3 -latk-1.0 -lpangoft2-1.0 -lpangocairo-1.0 -lgdk_pixbuf-2.0 -lcairo-gobject -lcairo -lpango-1.0 -lfreetype -lfontconfig -lX11 -llightdm-gobject-1 -lgio-2.0 -lgobject-2.0 -lgthread-2.0 -lgmodule-2.0 -lrt -lglib-2.0
libtool: link: gcc -DGETTEXT_PACKAGE=\"lightdm-gtk-greeter\" -DLOCALEDIR=\"/usr/share/locale\" -DGREETER_DATA_DIR=\"\" -DCONFIG_FILE=\"/lightdm-gtk-greeter.conf\" -DGSEAL_ENABLE -pthread -I/usr/include/gtk-3.0 -I/usr/include/atk-1.0 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/pango-1.0 -I/usr/include/gio-unix-2.0/ -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include -I/usr/include/pixman-1 -I/usr/include/freetype2 -I/usr/include/libpng12 -I/usr/include/lightdm-gobject-1 -I/usr/include/cairo -I/usr/include/libxml2 -Wall -Wmissing-prototypes -Wnested-externs -Wpointer-arith -Wno-sign-compare -g -O2 -fPIE -fstack-protector --param=ssp-buffer-size=4 -Wformat -Wformat-security -Werror=format-security -fPIE -pie -Wl,-z -Wl,relro -Wl,-z -Wl,now -Wl,--as-needed -Wl,-O1 -o lightdm-gtk-greeter lightdm_gtk_greeter-lightdm-gtk-greeter.o -pthread -Wl,--export-dynamic -lgtk-3 -lgdk-3 -latk-1.0 -lpangoft2-1.0 -lpangocairo-1.0 -lgdk_pixbuf-2.0 /usr/lib/libcairo-gobject.so /usr/lib/libcairo.so -lpango-1.0 /usr/lib/x86_64-linux-gnu/libfreetype.so -lfontconfig -lX11 -llightdm-gobject-1 -lgio-2.0 -lgobject-2.0 -lgthread-2.0 -lgmodule-2.0 -lrt -lglib-2.0 -pthread