--- a/xscreensaver.SlackBuild	2021-04-02 19:24:36.971695613 +0000
+++ b/xscreensaver.SlackBuild	2021-10-15 12:25:24.521496106 +0000
@@ -52,6 +52,12 @@
 elif [ "$ARCH" = "s390" ]; then
   SLKCFLAGS="-O2"
   LIBDIRSUFFIX=""
+elif [ "$ARCH" = "aarch64" ]; then
+  SLKCFLAGS="-O2 -fPIC"
+  LIBDIRSUFFIX="64"
+elif [ "$ARCH" = "riscv64" ]; then
+  SLKCFLAGS="-O2 -fPIC"
+  LIBDIRSUFFIX="64"
 elif [ "$ARCH" = "x86_64" ]; then
   SLKCFLAGS="-O2 -fPIC"
   LIBDIRSUFFIX="64"
@@ -100,7 +106,7 @@
   -exec chmod 644 {} \+
 
 xml_config=/usr/bin/xml-config xml2_config=/usr/bin/xml2-config \
-CFLAGS="$SLKCFLAGS" \
+CFLAGS="$SLKCFLAGS -flax-vector-conversions" \
 CXXFLAGS="$SLKCFLAGS" \
 ./configure \
   --prefix=/usr \