I was trying to build NetworkManager in my jhbuild sandbox (gnome-2-16,
dbus-glib from git repository). This is the build failure message:

 gcc -DHAVE_CONFIG_H -I. -I. -I../.. -I../.. -I../../include -I../../libnm-util
-I../../utils -I../../src -I../../src/named-manager
-I/opt/gnome2/include/dbus-1.0 -I/opt/gnome2/lib/dbus-1.0/include
-I/opt/gnome2/include/glib-2.0 -I/opt/gnome2/lib/glib-2.0/include
-DDBUS_VERSION_MAJOR=0 -DDBUS_VERSION_MINOR=94 -DDBUS_VERSION_MICRO=0 -pthread
-I/opt/gnome2/include/glib-2.0 -I/opt/gnome2/lib/glib-2.0/include
-DDBUS_API_SUBJECT_TO_CHANGE -I/opt/gnome2/include/hal
-I/opt/gnome2/include/dbus-1.0 -I/opt/gnome2/lib/dbus-1.0/include -g -Wall
-DDBUS_API_SUBJECT_TO_CHANGE -DG_DISABLE_DEPRECATED
-DBINDIR=\"/opt/gnome2/bin\" -DDATADIR=\"/opt/gnome2/share\"
-DSYSCONFDIR=\"/opt/gnome2/etc\" -Wall -Werror -std=gnu89 -g -O2 -lz -Wshadow
-Wmissing-declarations -Wmissing-prototypes -Wdeclaration-after-statement
-Wfloat-equal -Wno-unused-parameter -Wno-sign-compare -MT
libvpn_manager_la-nm-vpn-connection.lo -MD -MP -MF
.deps/libvpn_manager_la-nm-vpn-connection.Tpo -c nm-vpn-connection.c  -fPIC
-DPIC -o .libs/libvpn_manager_la-nm-vpn-connection.o
cc1: warnings being treated as errors
In file included from /opt/gnome2/include/dbus-1.0/dbus/dbus-glib.h:137,
                 from
/opt/gnome2/include/dbus-1.0/dbus/dbus-glib-lowlevel.h:27,
                 from ../../src/NetworkManagerDbusUtils.h:27,
                 from nm-dbus-vpn.h:25,
                 from nm-vpn-connection.c:25:
/opt/gnome2/include/dbus-1.0/dbus/dbus-gtype-specialized.h:50: warning:
declaration of 'index' shadows a global declaration
/usr/include/string.h:304: warning: shadowed declaration is here
/opt/gnome2/include/dbus-1.0/dbus/dbus-gtype-specialized.h:95: warning:
declaration of 'index' shadows a global declaration
/usr/include/string.h:304: warning: shadowed declaration is here
/opt/gnome2/include/dbus-1.0/dbus/dbus-gtype-specialized.h:98: warning:
declaration of 'index' shadows a global declaration
/usr/include/string.h:304: warning: shadowed declaration is here
In file included from ../../src/NetworkManagerMain.h:28,
                 from ../../src/NetworkManagerDbusUtils.h:31,
                 from nm-dbus-vpn.h:25,
                 from nm-vpn-connection.c:25:
/opt/gnome2/include/hal/libhal.h:309: warning: declaration of 'index' shadows a
global declaration
/usr/include/string.h:304: warning: shadowed declaration is here
make[3]: *** [libvpn_manager_la-nm-vpn-connection.lo] Error 1
make[3]: Leaving directory
`/home/luca/cvs/gnome2/NetworkManager/src/vpn-manager'
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory `/home/luca/cvs/gnome2/NetworkManager/src'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/luca/cvs/gnome2/NetworkManager'
make: *** [all] Error 2

A bug against NetworkManager was opened on GNOME Bugzilla
(http://bugzilla.gnome.org/show_bug.cgi?id=356512). It was closed by Dan
Williams as NOTGNOME, errors should be related to a shadow issue in dbus-glib