stalwart-mail: fix 16 KB page size on ARM systems (#426090)

pkgs/by-name/st/stalwart-mail/package.nix

@@ -59,12 +59,18 @@ rustPlatform.buildRustPackage (finalAttrs: {
   ++ lib.optionals withFoundationdb [ "foundationdb" ]
   ++ lib.optionals stalwartEnterprise [ "enterprise" ];
 
-  env = {
-    OPENSSL_NO_VENDOR = true;
-    ZSTD_SYS_USE_PKG_CONFIG = true;
-    ROCKSDB_INCLUDE_DIR = "${rocksdb}/include";
-    ROCKSDB_LIB_DIR = "${rocksdb}/lib";
-  };
+  env =
+    {
+      OPENSSL_NO_VENDOR = true;
+      ZSTD_SYS_USE_PKG_CONFIG = true;
+      ROCKSDB_INCLUDE_DIR = "${rocksdb}/include";
+      ROCKSDB_LIB_DIR = "${rocksdb}/lib";
+    }
+    // lib.optionalAttrs
+      (stdenv.hostPlatform.isLinux && (stdenv.hostPlatform.isAarch64 || stdenv.hostPlatform.isArmv7))
+      {
+        JEMALLOC_SYS_WITH_LG_PAGE = 16;
+      };
 
   postInstall = ''
     mkdir -p $out/etc/stalwart