diff --git a/academic/units/units.SlackBuild b/academic/units/units.SlackBuild
index d9bfa5352d..760f771dfd 100644
--- a/academic/units/units.SlackBuild
+++ b/academic/units/units.SlackBuild
@@ -3,7 +3,7 @@
 
 # Slackware build script for gnu units
 
-# Copyright (c) 2010 Gregory J.L. Tourte <artourter@gmail.com>
+# Copyright (c) 2010-2021 Gregory J. L. Tourte <artourter@gmail.com>
 # Previously maintained by Yalla-One <yallaone@gmail.com>
 # All rights reserved.
 #
@@ -27,7 +27,7 @@
 cd $(dirname $0) ; CWD=$(pwd)
 
 PRGNAM=units
-VERSION=${VERSION:-2.20}
+VERSION=${VERSION:-2.21}
 BUILD=${BUILD:-1}
 TAG=${TAG:-_SBo}
 PKGTYPE=${PKGTYPE:-tgz}
@@ -81,6 +81,8 @@ find -L . \
  \( -perm 666 -o -perm 664 -o -perm 640 -o -perm 600 -o -perm 444 \
   -o -perm 440 -o -perm 400 \) -exec chmod 644 {} \;
 
+
+PYTHON=/usr/bin/python3 \
 CFLAGS="$SLKCFLAGS" \
 CXXFLAGS="$SLKCFLAGS" \
 ./configure \
@@ -94,6 +96,7 @@ CXXFLAGS="$SLKCFLAGS" \
   --build=$ARCH-slackware-linux
 
 make
+make units_cur_inst
 make install DESTDIR=$PKG
 
 find $PKG -print0 | xargs -0 file | grep -e "executable" -e "shared object" | grep ELF \
diff --git a/academic/units/units.info b/academic/units/units.info
index 72cad5e9c9..195a9c1a75 100644
--- a/academic/units/units.info
+++ b/academic/units/units.info
@@ -1,8 +1,8 @@
 PRGNAM="units"
-VERSION="2.20"
+VERSION="2.21"
 HOMEPAGE="https://www.gnu.org/software/units/"
-DOWNLOAD="https://ftpmirror.gnu.org/units/units-2.20.tar.gz"
-MD5SUM="28e2ba6fd2dbf056b7559e03c31577d5"
+DOWNLOAD="https://ftpmirror.gnu.org/units/units-2.21.tar.gz"
+MD5SUM="8fc4884bf5f7dab10b5a31bdf7726c2d"
 DOWNLOAD_x86_64=""
 MD5SUM_x86_64=""
 REQUIRES="Unidecode"