Index: flate2/Cargo.toml
===================================================================
--- flate2.orig/Cargo.toml
+++ flate2/Cargo.toml
@@ -49,10 +49,6 @@ rustdoc-args = [
 [dependencies.crc32fast]
 version = "1.2.0"
 
-[dependencies.libz-ng-sys]
-version = "1.1.8"
-optional = true
-
 [dependencies.libz-sys]
 version = "1.1.8"
 optional = true
@@ -84,14 +80,6 @@ zlib-default = [
     "any_zlib",
     "libz-sys/default",
 ]
-zlib-ng = [
-    "any_zlib",
-    "libz-ng-sys",
-]
-zlib-ng-compat = [
-    "zlib",
-    "libz-sys/zlib-ng",
-]
 
 [target."cfg(all(target_arch = \"wasm32\", not(target_os = \"emscripten\")))".dependencies.miniz_oxide]
 version = "0.7.1"