Comment 18 for bug 1316384

Trying to backport Julien's fixed version from Utopic to Trusty, I'm getting the error:

make[4]: Leaving directory `/mnt/home/samjnaa-trusty/sr/_backport/lxsession-0.4.9.2+git20140410/lxpolkit'
  CC lxpolkit-main.o
  CC lxpolkit-lxpolkit.o
lxpolkit.c:38:93: error: format string is not a string literal (potentially insecure)
      [-Werror,-Wformat-security]
    GtkWidget* dlg = gtk_message_dialog_new(parent, GTK_DIALOG_MODAL, type, GTK_BUTTONS_OK, msg);
                                                                                            ^~~
1 error generated.
make[3]: *** [lxpolkit-lxpolkit.o] Error 1
make[3]: Leaving directory `/mnt/home/samjnaa-trusty/sr/_backport/lxsession-0.4.9.2+git20140410/lxpolkit'
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory `/mnt/home/samjnaa-trusty/sr/_backport/lxsession-0.4.9.2+git20140410'
make[1]: *** [all] Error 2
make[1]: Leaving directory `/mnt/home/samjnaa-trusty/sr/_backport/lxsession-0.4.9.2+git20140410'
dh_auto_build: make -j1 returned exit code 2
make: *** [build] Error 2
dpkg-buildpackage: error: debian/rules build gave error exit status 2

Any suggestions how to fix?