scons
scons: Reading SConscript files ...
cpu: x86_64
OS: Linux
Package x11 was not found in the pkg-config search path.
Perhaps you should add the directory containing `x11.pc'
to the PKG_CONFIG_PATH environment variable
No package 'x11' found
OSError: 'pkg-config --cflags --libs x11' exited 1:
  File "/home/vytautas/Downloads/xreal-et/trunk/SConstruct", line 263:
    SConscript('SConscript_engine', variant_dir = 'build/engine', duplicate = 0)
  File "/usr/lib/scons/SCons/Script/SConscript.py", line 614:
    return method(*args, **kw)
  File "/usr/lib/scons/SCons/Script/SConscript.py", line 551:
    return _SConscript(self.fs, *files, **subst_kw)
  File "/usr/lib/scons/SCons/Script/SConscript.py", line 260:
    exec _file_ in call_stack[-1].globals
  File "/home/vytautas/Downloads/xreal-et/trunk/SConscript_engine", line 504:
    local_env.ParseConfig('pkg-config --cflags --libs x11')
  File "/usr/lib/scons/SCons/Environment.py", line 1460:
    return function(self, self.backtick(command))
  File "/usr/lib/scons/SCons/Environment.py", line 593:
    raise OSError("'%s' exited %d" % (command, status))