Building on HP-UX 11.00, using GCC 3.3.2 (jnw)
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I have managed to build Xvnc on HP-UX using GCC 3.3.2, by updating the
earlier "ugly hacking" of the X tree to cope with using GCC instead of aCC.
(aCC is the commercial HP-UX C++ compiler, whereas GCC is free, if you can find a build for your system).

These build settings are known to work on HP-UX 11.00, with the following requirements:

. From http://www.xfree86.org/ - XFree86 Project Web Site
  - XFree86 4.2.0 source code (tarballs 1 & 2 are sufficient)

. From http://devrsrc1.external.hp.com/LPK/ - HP's Linux Porting Kit 1.0
  - GCC 3.3.2 - GCC C & C++ compilers
  - patch 2.5.4 - GNU patch command
  - make 3.80 - GNU make
  - [optional, see below] X11R6incs 4.3.0 - X11 headers

. From http://www.software.hp.com/ - HP's Software Depot home
  - B3394BA.X11MotifDevKit.X11R6-PRG B.11.00.03 - X11 R6 Programming Environment

. From http://www1.itrc.hp.com/ - HP's IT Resource Center
  - PHSS_30967 - ld(1) and linker tools cumulative patch for HP-UX 11.00

Ensure that gcc and the GCC version of c++ are on your path, so that configure can find them.

Build the main part of the VNC distribution as normal:

  % ./configure
  % make

Set the CC environment variable:

  % CC=gcc
  % export CC

Unpack the X tree and apply the patches in xc.patch:

  % gunzip -c X420src-1.tgz | tar xf -
  % patch -Np0 <xc.patch

Then additionally apply the patches in hpux_gcc.patch:

  % patch -Np0 <hpux_gcc.patch

Finally try building the X tree:

  % cd xc
  % make World

If it all goes to plan you will be left with Xvnc in xc/programs/Xserver.  You
will probably have to modify the vncserver script to set up a sensible font
path, since many of the font directories on HPUX are different from the
defaults compiled into Xvnc.  Note that the vncserver script also requires perl,
which is not on the path by default on HPUX 11.00.

If you don't care about x0vncserver, and you don't have the X11 development files
(B3394BA), then you can instead compile everything else (including Xvnc) with
only the Linux Porting Kit's X11R6incs package installed.  You'll need to remove
x0vncserver explicitly from the top level Makefile.in before running configure
in order to do this.

If anyone can find a neater way of building a VNC-compatible X tree on HPUX
please let us know (see http://www.tightvnc.com for contact details).