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<H1><A NAME="SECTION000160000000000000000">
Frequently asked questions</A>
</H1>
<OL>
<LI>Is there a home page for V<SMALL>IEWMOL</SMALL> ?
<BR>
There is a home page at <A NAME="tex2html34"
HREF="http://viewmol.sourceforge.net/"><TT>http://viewmol.sourceforge.net/</TT></A>
and a project page at
<A NAME="tex2html35"
HREF="http://sourceforge.net/projects/viewmol/"><TT>http://sourceforge.net/projects/viewmol/</TT></A>.
</LI>
<LI>V<SMALL>IEWMOL</SMALL> on Linux reports on start up:
<BR><code>viewmol: can't load library 'libMesaGLU.so.3'</code>
<BR>
or another library.
<BR>
V<SMALL>IEWMOL</SMALL> does not find a dynamical linked library it needs. The reason for this
is that either the library is not installed, the wrong version is installed, or the dynamic
linker is not set up to find this library. V<SMALL>IEWMOL</SMALL> needs the following
dynamic libraries:
<PRE>
libtiff.so.3
libGLU.so.1
libGL.so.1
libXm.so.2
libXp.so.6
libXi.so.6
libXext.so.6
libXt.so.6
libX11.so.6
libpthread.so.0
libdb.so.3
libutil.so.1
libdl.so.2
libm.so.6
libc.so.6
libjpeg.so.62
libz.so.1
libSM.so.6
libICE.so.6
libXmu.so.6
/lib/ld-linux.so.2
</PRE>
These libraries can normally be found in <code>/lib</code>, <code>/usr/lib</code>, and
<BR><code>/usr/X11R6/lib</code>. The dynamic linker checks the major version number and will
refuse any library where the major version number does not match. The minor version
number does not matter. The dynamic linker has to be set up to search the directories
which contain these libraries. This is done in the file <code>/etc/ld.so.conf</code>. After
modifying this file run <code>ldconfig -v</code> as root. Alternatively, the environment
variable <code>LD_LIBRARY_PATH</code> can be set to point to these directories.
</LI>
<LI>After the splash screen appears on Linux V<SMALL>IEWMOL</SMALL> stops with a segmentation
fault
<BR>
Segmentation faults occur reproducibly for certain operations on Linux
<BR>
There is a compatibility problem with a library, usually libc. Unfortunately, there
are so many different library versions in use among the different distributions, that
there is a good chance to run into problems. If it is impossible to use the exact
same distribution V<SMALL>IEWMOL</SMALL> was compiled on (see README file), recompilation
usually helps.
</LI>
<LI>V<SMALL>IEWMOL</SMALL> on Linux reports on start up:
<BR><code>viewmol: Symbol 'jpeg_resync_to_restart' is not</code>
<BR><code>defined.</code>
<BR>
There are two different versions of <code>libtiff.so</code> distributed with different Linux distributions.
One contains jpeg code (Debian) the other doesn't (RedHat). V<SMALL>IEWMOL</SMALL> has now been linked
with the version which does not contain jpeg code so that this error will probably not occur
anymore. If this error occurs only a recompilation will help. Please notify the maker of your
Linux distribution so that they can make their distribution compatible.
</LI>
<LI>When I try to recompile V<SMALL>IEWMOL</SMALL> I get a lot of error messages:
<PRE>
cc -c -Wall -DLINUX -I/usr/compat/linux/usr/include/GL/
-I/usr/compat/linux/usr/include/gr/ -O6 -m486
-fomit-frame-pointer
../annotate.c
../annotate.c:19: X11/StringDefs.h: No such file or directory
../annotate.c:20: X11/cursorfont.h: No such file or directory
../annotate.c:21: Xm/Xm.h: No such file or directory
../annotate.c:22: Xm/Text.h: No such file or directory
In file included from ../annotate.c:24:
../viewmol.h:20: X11/Intrinsic.h: No such file or directory
../viewmol.h:21: GL/gl.h: No such file or directory
../viewmol.h:22: GL/glx.h: No such file or directory
*** Error code 1
</PRE>
To recompile V<SMALL>IEWMOL</SMALL> you need to install X windows and OpenGL development environments
which, in most Linux distributions, are separate packages. In this case you are missing
all X windows and OpenGL header files. You also need the development environment of Lesstif
or Motif for all header files in <code>/usr/include/Xm</code>.
</LI>
<LI>While trying to recompile V<SMALL>IEWMOL</SMALL> the link step fails with:
<PRE>
ld:
Unresolved: __eprintf
*** Error code 1 (bu21)
</PRE>
or a similar message referring to <code>__eprintf</code> (encountered on SGIs and IBMs
so far only). There is a problem with the TIFF library you are linking with. If
you have built the library yourself make sure it was built on the same machine
as where you try to link V<SMALL>IEWMOL</SMALL>. If you have been trying to use a vendor
supplied version of the TIFF library try to download and compile the library
yourself.
</LI>
</OL>
<P>
<BR><HR>
<ADDRESS>
<A HREF="mailto:joehill@users.sourceforge.net"><I>Jrg-Rdiger Hill</I></A><BR>Sun Dec 10 17:38:35 MET 2000
</ADDRESS>
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