Compile error?

[Nils Barth <nils_barth post harvard edu>]

I'm having trouble compiling GTK.
After compiling and installing CVS HEAD glib, I check out CVS HEAD
gtk+, and autogen.sh dies with:
./configure: syntax error near unexpected token
`AM_PATH_GLIB_2_0(1.3.1,,'
./configure: ./configure: line 4315: `  AM_PATH_GLIB_2_0(1.3.1,,'

(or rather, it ends with:
Now type 'make' to compile Gtk+.
and then make has no targets and dies)

How can I fix this?

-- 
  -nils
Public key: http://www.fas.harvard.edu/~nbarth/pub-key.txt

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