where is X11/Xaw/Form.h in ubuntu/linux10.04?

[eric lin]

root at eric-laptop:/usr# cd ..
root at eric-laptop:/# find . | grep Xaw
./usr/lib/libXaw7.so.7
./usr/lib/libXaw7.so.7.0.0
./usr/lib/libXaw.so.7
./etc/gnome/config/Xaw.ad
root at eric-laptop:/# 
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I tried to copy and run a piece code from book "X Window Programming from sCRATCH"
by J. robert brown, especially auhtor specify it is "building an application using linux and c"  , but i can not find any its Form.h file in my whole harddisk with ubuntu/linux 10.04
please help
Eric, in us