--- a/tar.SlackBuild	2021-02-16 18:11:01.478546468 +0200
+++ b/tar.SlackBuild	2021-02-16 18:11:44.063450290 +0200
@@ -62,6 +62,10 @@
   SLKCFLAGS="-O2"
 elif [ "$ARCH" = "x86_64" ]; then
   SLKCFLAGS="-O2 -fPIC"
+elif [ "$ARCH" = "aarch64" ]; then
+  SLKCFLAGS="-O2 -fPIC"
+elif [ "$ARCH" = "riscv64" ]; then
+  SLKCFLAGS="-O2 -fPIC"
 else
   SLKCFLAGS="-O2"
 fi
@@ -93,6 +97,7 @@
 ./configure \
   --prefix=/usr \
   --disable-nls \
+  --host=$ARCH-slackware-linux \
   --build=$ARCH-slackware-linux || exit 1
 make $NUMJOBS || make || exit 1
 mkdir -p $PKG/bin