comrade brian wildasinn writes:

  Hi!
  I'm still trying to configure lesstif-0.79 on a netbsd system which the
  INSTALL file says is supported, but configure stops
  > with:
  > ./configure --with-shared
  > ...
  > checking Xt Revision Number 6 ... no
  > checking Xt Revision Number 5 ... no
  > configure: error: you must have X11 Revision 5 or higher to compile
  > Lesstif.
 
It searches through a list of directories for a particular header file and
then compiles a small test program which includes that header.  For the
exact list, check in configure.in.

The configure messages above make me think either your installation is
incomplete (do you have an Intrinsic.h in your include directory?) or
the permissions are such that you can't read it.
 
  I really don't know what happening with configure, but there is no X11.h
  in this machine's /usr/X11R6/include/X11/ directory, or the X11R6
  binaries at netbsd.org; There is an Xt library at
  /usr/X11R6/lib/libXt.so.6.o.
 
It's not X11.h that configure looks at.  It's Intrinsic.h.

So, from the above lines, it seems your X installation is:

/usr/X11R6/lib -- contains the .so's
/usr/X11R6/include -- contains the headers.

configure should have no problem with this.  Can you send me the output
of ls -lR /usr/X11R6?

Christoph