pkgconf problem

Running pkg-config
Full command args: ['pkg-config', '/tmp/work/webkit-1.8.3/Tools/gtk/../Scripts/../../Source/WebKit/gtk/webkitgtk-3.0.pc', '--cflags']
Package glib-2.0 was not found in the pkg-config search path.
Perhaps you should add the directory containing `glib-2.0.pc'
to the PKG_CONFIG_PATH environment variable
Package 'glib-2.0', required by 'webkitgtk-3.0', not found
Generating WebKit1 documentation...
Traceback (most recent call last):
  File "./generate-gtkdoc", line 166, in <module>
    saw_webkit1_warnings = generate_doc(pkg_config_path, options)
  File "./generate-gtkdoc", line 137, in generate_doc
    generator = gtkdoc.PkgConfigGTKDoc(pkg_config_path, options)
  File "/tmp/work/webkit-1.8.3/Tools/gtk/gtkdoc.py", line 398, in __init__
    '--cflags'], print_output=True)
  File "/tmp/work/webkit-1.8.3/Tools/gtk/gtkdoc.py", line 198, in _run_command
    % (args[0], process.returncode))
Exception: pkg-config produced a non-zero return code 1