See http://build.gnome.org/continuous/buildmaster/builds/2015/03/04/39/build/log-NetworkManager.txt:

libtool: link: gcc -Wall -std=gnu89 -Wshadow -Wmissing-declarations -Wmissing-prototypes -Wdeclaration-after-statement -Wformat-security -Wfloat-equal -Wno-unused-parameter -Wno-sign-compare -Wstrict-prototypes -fno-strict-aliasing -Wno-unused-but-set-variable -Wundef -Wimplicit-function-declaration -Wpointer-arith -Winit-self -Wmissing-include-dirs -O2 -g -m64 -mtune=generic -rdynamic -o NetworkManager nm-device-bond.o nm-device-bridge.o nm-device-ethernet.o nm-device-gre.o nm-device-infiniband.o nm-device-macvlan.o nm-device-tun.o nm-device-veth.o nm-device-vlan.o nm-device-vxlan.o nm-dhcp-dhclient.o nm-dhcp-dhclient-utils.o nm-dhcp-dhcpcd.o nm-dhcp-systemd.o main-utils.o main.o  ./.libs/libNetworkManager.a -luuid -lnss3 -lnssutil3 -lsmime3 -lssl3 -lplds4 -lplc4 -lnspr4 -lpthread -ldbus-glib-1 -ldbus-1 -lgio-2.0 -lgmodule-2.0 -lgudev-1.0 -lgobject-2.0 -lglib-2.0 -lnl-route-3 -lnl-genl-3 -lnl-3 -lndp -ldl -lm -pthread
/usr/lib/gcc/x86_64-gnomeostree-linux/4.9.1/../../../../x86_64-gnomeostree-linux/bin/ld: ./.libs/libNetworkManager.a(nm-session-monitor.o): undefined reference to symbol 'sd_login_monitor_get_fd@@LIBSYSTEMD_209'
//lib/libsystemd.so.0: error adding symbols: DSO missing from command line