On HP-UX 11.00 X11/Xaw/Form.h requires X11/Intrinsic.h

[Göran Uddeborg]

When configuring ddd 3.3.8 on HP-UX 11.0 (hppa2.0w-hp-hpux11.00) with
the options

    --with-athena-includes=/usr/contrib/X11R6/include 
--with-athena-libraries=/usr/contrib/X11R6/lib

I get these error messages:

    checking X11/Xaw/Form.h usability... no
    checking X11/Xaw/Form.h presence... yes
    configure: WARNING: X11/Xaw/Form.h: present but cannot be compiled
    configure: WARNING: X11/Xaw/Form.h: check for missing prerequisite headers?
    configure: WARNING: X11/Xaw/Form.h: proceeding with the preprocessor's 
result
    checking for X11/Xaw/Form.h... yes

/usr/contrib/X11R6 is where HP places Xaw.  Looking a bit at this, it
appears to check for this header file by trying to compile something
equivalent to

    #include <X11/Xaw/Form.h>

However, this doesn't compile.  I don't know X very well, but it
appears that you need

    #include <X11/Intrinsic.h>
    #include <X11/Xaw/Form.h>

Intrinsic.h does indeed seem to be included wherever Form.h is
included in the source code.  So it appears this is just a limitation
in configure.