Error in compiling during install:
checking for tk.tcl... ../lib/tk8.4
checking for X11 header files
can't find X includes
otcl-1.13 configuration failed! Exiting ...
Please check http://www.isi.edu/nsnam/ns/ns-problems.html
for common problems and bug fixes.
This is ns-allinone-2.34 on Fedora Core 15, I am guessing some Fedora files have been moved around.