--- a/ntp.SlackBuild	2021-02-13 01:56:41.108962985 +0200
+++ b/ntp.SlackBuild	2021-02-13 01:57:02.424957943 +0200
@@ -52,6 +52,10 @@
   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