[XeTeX] protrusion xetex configure error

[Stephen Moye]

Mac OS X, 10.6.3, protrusion xetex revision 980

I did this before starting:

setenv SDK_ROOT /Developer/SDKs/MacOSX10.5.sdk/
setenv CC "gcc-4.0"
setenv CXX "g++-4.0"

I'm getting this error at the configure stage:

configure: You requested to build `web2c' using an installed `kpathsea' version,
configure:     which requires to locate the <kpathsea/paths.h> header file.
configure: error: Sorry, not found under any of: /usr/include /usr/local/include *****
~/microxetex: 12:45

This did not happen with revision 978.

What am I doing wrong?

Thanks

Stephen Moye