ratpoints: fix aarch64 build

pkgs/by-name/ra/ratpoints/package.nix

@@ -34,9 +34,17 @@ stdenv.mkDerivation (finalAttrs: {
   buildInputs = [ gmp ];
 
   makeFlags = [ "CC=${stdenv.cc.targetPrefix}cc" ];
-  buildFlags = lib.optionals stdenv.hostPlatform.isDarwin [
-    "CCFLAGS2=-lgmp -lc -lm"
-    "CCFLAGS=-UUSE_SSE"
+  buildFlags = [
+    "CCFLAGS1=${
+      if stdenv.hostPlatform.avx512Support then
+        "-DUSE_AVX512 -mavx512f"
+      else if stdenv.hostPlatform.avx2Support then
+        "-DUSE_AVX -mavx2"
+      else if stdenv.hostPlatform.avxSupport then
+        "-DUSE_AVX -mavx"
+      else
+        "-DUSE_SSE"
+    }"
   ];
   installFlags = [ "INSTALL_DIR=$(out)" ];