--- a/SDL2_gfx.SlackBuild	2021-02-13 03:03:06.888102564 +0200
+++ b/SDL2_gfx.SlackBuild	2021-02-13 03:03:43.960083638 +0200
@@ -64,6 +64,14 @@
   SLKCFLAGS="-O3 -march=armv7-a -mfpu=vfpv3-d16"
   LIBDIRSUFFIX=""
   MMX="--disable-mmx"
+elif [ "$ARCH" = "aarch64" ]; then
+  SLKCFLAGS="-O2 -fPIC"
+  LIBDIRSUFFIX="64"
+  MMX="--disable-mmx"
+elif [ "$ARCH" = "riscv64" ]; then
+  SLKCFLAGS="-O2 -fPIC"
+  LIBDIRSUFFIX="64"
+  MMX="--disable-mmx"
 else
   SLKCFLAGS="-O2"
   LIBDIRSUFFIX=""