diff --git a/ptyprocess/ptyprocess.SlackBuild b/ptyprocess/ptyprocess.SlackBuild
index 1e1f4a8..97c9a4a 100644
--- a/ptyprocess/ptyprocess.SlackBuild
+++ b/ptyprocess/ptyprocess.SlackBuild
@@ -24,7 +24,7 @@
 
 PRGNAM=ptyprocess
 VERSION=${VERSION:-0.5.1}
-BUILD=${BUILD:-1}
+BUILD=${BUILD:-2}
 TAG=${TAG:-_csb}
 
 if [ -z "$ARCH" ]; then
@@ -73,6 +73,11 @@ find -L . \
 
 python setup.py install --root=$PKG
 
+# Python 3 support.
+if $(python3 -c 'import sys' 2>/dev/null); then
+  python3 setup.py install --root=$PKG
+fi
+
 find $PKG -print0 | xargs -0 file | grep -e "executable" -e "shared object" | grep ELF \
   | cut -f 1 -d : | xargs strip --strip-unneeded 2> /dev/null || true