python/six: make installing python3 bindings a custom option

Signed-off-by: Larry Hajali <larryhaja[at]gmail[dot]com>

python/six/README

@@ -3,6 +3,8 @@ smoothing over the differences between the Python versions with the goal of
 writing Python code that is compatible on both Python versions. See the
 documentation for more information on what is provided.
 
-Optional: html documentation and man pages will be installed if Pygments and
-Sphinx are installed.  Python3 module will be built if Python3 is installed.
-Pysetuptools is an optional build time dependency.
+Optional dependencies: python3 and Sphinx
+
+Note: To install python3 bindings pass PYTHON3=yes to the slackbuild.
+
+  # PYTHON3=yes ./six.SlackBuild

python/six/six.SlackBuild

@@ -29,7 +29,7 @@ TAG=${TAG:-_SBo}
 
 if [ -z "$ARCH" ]; then
   case "$( uname -m )" in
-    i?86) ARCH=i486 ;;
+    i?86) ARCH=i586 ;;
     arm*) ARCH=arm ;;
        *) ARCH=$( uname -m ) ;;
   esac
@@ -57,7 +57,7 @@ find -L . \
 
 python setup.py install --root=$PKG
 
-if $(python3 -c 'import os' 2>/dev/null); then
+if [ "${PYTHON3:-no}" == "yes" ]; then
   python3 setup.py install --root=$PKG
 fi