3.24.0 release tarball is unbuildable:

make[3]: Entering directory '/home/mcatanzaro/.cache/jhbuild/build/gnome-system-monitor-3.24.0/src'
  CXX      interface.o
  CXX      argv.o
  CXX      load-graph.o
  CXX      proctable.o
  CXX      prettytable.o
  CXX      util.o
  CXX      memmaps.o
  CXX      procactions.o
  CXX      procdialogs.o
  CXX      openfiles.o
  CXX      procproperties.o
  CXX      smooth_refresh.o
  CXX      disks.o
  CXX      selinux.o
  CXX      systemd.o
  CXX      cgroups.o
  CXX      gsm_gnomesu.o
  CXX      gsm_gksu.o
  CXX      gsm_pkexec.o
  CXX      lsof.o
  CXX      prefsdialog.o
  CXX      application.o
make[3]: *** No rule to make target 'legacy/gsm-resources.o', needed by 'gnome-system-monitor'.  Stop.
make[3]: *** Waiting for unfinished jobs....
  CXX      main.o
make[3]: Leaving directory '/home/mcatanzaro/.cache/jhbuild/build/gnome-system-monitor-3.24.0/src'
Makefile:641: recipe for target 'all-recursive' failed
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory '/home/mcatanzaro/.cache/jhbuild/build/gnome-system-monitor-3.24.0/src'
Makefile:599: recipe for target 'all-recursive' failed
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory '/home/mcatanzaro/.cache/jhbuild/build/gnome-system-monitor-3.24.0'
Makefile:464: recipe for target 'all' failed
make: *** [all] Error 2

There is a rule to generate gsm-resources.c but no rule to build it... I'm really confused, how does this possibly work for you or anyone?