--- a/gnuchess.SlackBuild	2021-02-13 00:43:39.524145155 +0200
+++ b/gnuchess.SlackBuild	2021-02-13 00:44:06.420117436 +0200
@@ -55,6 +55,10 @@
   SLKCFLAGS="-O2 -fcommon"
 elif [ "$ARCH" = "x86_64" ]; then
   SLKCFLAGS="-O2 -fPIC -fcommon"
+elif [ "$ARCH" = "aarch64" ]; then
+  SLKCFLAGS="-O2 -fPIC -fcommon"
+elif [ "$ARCH" = "riscv64" ]; then
+  SLKCFLAGS="-O2 -fPIC -fcommon"
 else
   SLKCFLAGS="-O2 -fcommon"
 fi