Virtual Box installation on Slackware-14.1 x32 on a 64bit machine.

Hello,

I am trying to install virtual box version 5.1.0 on Slackware 14.1x32 on
a 64 bit laptop. I am receiving the following message when running this version as follows:

~/virtualbox/VirtualBox-5.1.0# ./configure
Checking for environment: Determined build machine: linux.x86, target machine: linux.x86, OK.
Checking for kBuild: found, OK.
Checking for gcc: found version 4.8.2, OK.
Checking for Open Watcom:
** Open Watcom was not found!
Checking for iasl: found version 20150204, OK.
Checking for xslt: found, OK.
Checking for mkisofs: found mkisofs 3.01a16 (i686-pc-linux-gnu) Copyright (C) 1993-1997 Eric Youngdale (C) 1997-2013 Joerg Schilling, OK.
Checking for pthread: found, OK.
Checking for libxml2: found version 2.9.1, OK.
Checking for libIDL: found version 0.8.14, OK.
Checking for ssl: found version OpenSSL 1.0.1e 11 Feb 2013, OK.
Checking for libcurl: found version 7.31.0, OK.
Checking for libvpx: found version 1.3.0, OK.
Checking for zlib: found version 1.2.8, OK.
Checking for libpng: found version 1.4.12, OK.
Checking for SDL: found version 1.2.15, OK.
Checking for X libraries:
Xlibs not found at -L/usr/X11R6/lib -L/usr/X11R6/lib64 -L/usr/local/lib -lXext -lX11 -I/usr/local/include or Xlibs headers not found
Check the file /root/virtualbox/VirtualBox-5.1.0/configure.log for detailed error information.
Check /root/virtualbox/VirtualBox-5.1.0/configure.log for details

Any help on getting Virtual Box installed if not this version then perhaps another one?

Thanks.

Regards,

jefsa