Web is written in C for use with the X WINDOW system under Motif. Most Linux distributions contain the Motif headers and run-time libraries however you may need to install them on your system as they sometimes not part of the default installation.
However Fedora Core 6 no longer comes with OpenMotif and therefore the libXm.so.3 library is not provided in /usr/lib and can not be downloaded easily through a package manager. Therefore, users installing on FC6 need to do the following or something like it (reference)
Download and install XFree86-stub
To install OpenMotif you need to satisfy some requirement of the legacy
package. Download and install XFree86-stub from
http://codtech.com/downloads/XFree86-stub.
E.g.
wget http://codtech.com/downloads/XFree86-stub/XFree86-stub-1.0-2.noarch.rpm
sudo rpm -Uvh XFree86-stub-1.0-2.noarch.rpm
Download and install OpenMotif
Download OpenMotif 2.2.2 from Fedora Legacy
http://www.fedoralegacy.org/updates/RH9/2005-05-12-FLSA_2005_152804__Updated_openmotif_packages_fix_image_vulnerability.html
or one of the mirrors and install it.
E.g.
wget http://mirrors.ircam.fr/pub/fedoralegacy/legacy/fedora/1/updates/i386/openmotif-+2.2.2-16.1.2.legacy.i386.rpm
sudo rpm -Uvh openmotif-2.2.2-16.1.2.legacy.i386.rpm
Yhanks to: John Rubinstein, U. of T. for some of the above info. (Mistakes are mine not his).