xfce4-namebar-plugin$ ./waf -v -v configure && ./waf -v -v build
Setting top to                           : /home/trent/Projects/xfce4-namebar-plugin
Setting out to                           : /home/trent/Projects/xfce4-namebar-plugin/build
Checking for 'gcc' (c compiler)          : ok
Checking for program pkg-config          : /usr/bin/pkg-config
Checking for 'gobject-2.0'               : 17:16:10 runner ['/usr/bin/pkg-config', 'gobject-2.0', '--cflags', '--libs']
yes
Checking for 'gthread-2.0'               : 17:16:10 runner ['/usr/bin/pkg-config', 'gthread-2.0', '--cflags', '--libs']
yes
Checking for program valac-0.8           : not found
Checking for program valac               : /usr/bin/valac
17:16:10 runner '/usr/bin/valac --version'
Checking for valac version >= (0, 8, 0)  : (0, 11, 0)
Checking for 'glib-2.0' >= 2.10          : 17:16:10 runner ['/usr/bin/pkg-config', '--atleast-version=2.10', 'glib-2.0']
17:16:10 runner ['/usr/bin/pkg-config', 'glib-2.0', '--cflags', '--libs']
yes
Checking for 'gtk+-2.0' >= 2.16          : 17:16:10 runner ['/usr/bin/pkg-config', '--atleast-version=2.16', 'gtk+-2.0']
17:16:10 runner ['/usr/bin/pkg-config', 'gtk+-2.0', '--cflags', '--libs']
yes
Checking for 'libxfce4panel-1.0' >= 4.6  : 17:16:10 runner ['/usr/bin/pkg-config', '--atleast-version=4.6', 'libxfce4panel-1.0']
17:16:10 runner ['/usr/bin/pkg-config', 'libxfce4panel-1.0', '--cflags', '--libs']
yes
Checking for 'xfce4-vala' >= 4.6         : 17:16:10 runner ['/usr/bin/pkg-config', '--atleast-version=4.6', 'xfce4-vala']
17:16:10 runner ['/usr/bin/pkg-config', 'xfce4-vala', '--cflags', '--libs']
yes
Checking for 'libwnck-1.0' >= 2.20       : 17:16:10 runner ['/usr/bin/pkg-config', '--atleast-version=2.20', 'libwnck-1.0']
17:16:10 runner ['/usr/bin/pkg-config', 'libwnck-1.0', '--cflags', '--libs']
yes
'configure' finished successfully (0.534s)
Waf: Entering directory `/home/trent/Projects/xfce4-namebar-plugin/build'
Traceback (most recent call last):
  File "/home/trent/Projects/xfce4-namebar-plugin/.waf3-1.6.0-4af58e0fb0887da2c8138dcd73286cf0/waflib/Scripting.py", line 77, in waf_entry_point
    run_commands()
  File "/home/trent/Projects/xfce4-namebar-plugin/.waf3-1.6.0-4af58e0fb0887da2c8138dcd73286cf0/waflib/Scripting.py", line 129, in run_commands
    run_command(cmd_name)
  File "/home/trent/Projects/xfce4-namebar-plugin/.waf3-1.6.0-4af58e0fb0887da2c8138dcd73286cf0/waflib/Scripting.py", line 122, in run_command
    ctx.execute()
  File "/home/trent/Projects/xfce4-namebar-plugin/.waf3-1.6.0-4af58e0fb0887da2c8138dcd73286cf0/waflib/Scripting.py", line 308, in execute
    return execute_method(self)
  File "/home/trent/Projects/xfce4-namebar-plugin/.waf3-1.6.0-4af58e0fb0887da2c8138dcd73286cf0/waflib/Build.py", line 99, in execute
    self.execute_build()
  File "/home/trent/Projects/xfce4-namebar-plugin/.waf3-1.6.0-4af58e0fb0887da2c8138dcd73286cf0/waflib/Build.py", line 102, in execute_build
    self.recurse([self.run_dir])
  File "/home/trent/Projects/xfce4-namebar-plugin/.waf3-1.6.0-4af58e0fb0887da2c8138dcd73286cf0/waflib/Context.py", line 117, in recurse
    user_function(self)
  File "/home/trent/Projects/xfce4-namebar-plugin/wscript", line 65, in build
    defines      = ['WNCK_I_KNOW_THIS_IS_UNSTABLE'])
  File "/home/trent/Projects/xfce4-namebar-plugin/.waf3-1.6.0-4af58e0fb0887da2c8138dcd73286cf0/waflib/Tools/errcheck.py", line 17, in call
    return oldcall(self,*k,**kw)
  File "/home/trent/Projects/xfce4-namebar-plugin/.waf3-1.6.0-4af58e0fb0887da2c8138dcd73286cf0/waflib/Configure.py", line 228, in fun
    return f(*k,**kw)
  File "/home/trent/Projects/xfce4-namebar-plugin/.waf3-1.6.0-4af58e0fb0887da2c8138dcd73286cf0/waflib/Tools/c_aliases.py", line 52, in program
    set_features(kw,'program')
  File "/home/trent/Projects/xfce4-namebar-plugin/.waf3-1.6.0-4af58e0fb0887da2c8138dcd73286cf0/waflib/Tools/c_aliases.py", line 50, in set_features
    kw['features']=Utils.to_list(kw.get('features',[]))+Utils.to_list(sniff_features(**kw))
  File "/home/trent/Projects/xfce4-namebar-plugin/.waf3-1.6.0-4af58e0fb0887da2c8138dcd73286cf0/waflib/Tools/c_aliases.py", line 19, in sniff_features
    exts=get_extensions(kw['source'])
KeyError: 'source'