--- rustc-beta-src/Cargo.lock.orig	2023-05-24 16:49:05.242510531 -0700
+++ rustc-beta-src/Cargo.lock	2023-05-24 16:51:11.741865603 -0700
@@ -1197,7 +1197,6 @@ checksum = "14d05c10f541ae6f3bc5b3d923c2
 dependencies = [
  "cc",
  "libc",
- "libnghttp2-sys",
  "libz-sys",
  "openssl-sys",
  "pkg-config",
@@ -2989,16 +2988,6 @@ source = "registry+https://github.com/ru
 checksum = "7fc7aa29613bd6a620df431842069224d8bc9011086b1db4c0e0cd47fa03ec9a"
 
 [[package]]
-name = "libnghttp2-sys"
-version = "0.1.4+1.41.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "03624ec6df166e79e139a2310ca213283d6b3c30810c54844f307086d4488df1"
-dependencies = [
- "cc",
- "libc",
-]
-
-[[package]]
 name = "libz-sys"
 version = "1.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
--- rustc-beta-src/src/tools/cargo/Cargo.toml.orig	2023-05-24 16:49:05.244510489 -0700
+++ rustc-beta-src/src/tools/cargo/Cargo.toml	2023-05-24 16:51:04.683013189 -0700
@@ -23,7 +23,7 @@ cargo-platform = { path = "crates/cargo-
 cargo-util = { path = "crates/cargo-util", version = "0.2.4" }
 clap = "4.2.0"
 crates-io = { path = "crates/crates-io", version = "0.36.0" }
-curl = { version = "0.4.44", features = ["http2"] }
+curl = { version = "0.4.44", features = [] }
 curl-sys = "0.4.61"
 env_logger = "0.10.0"
 filetime = "0.2.9"
--- rustc-beta-src/src/tools/cargo/src/cargo/core/package.rs.orig	2023-05-19 19:05:42.000000000 -0700
+++ rustc-beta-src/src/tools/cargo/src/cargo/core/package.rs	2023-05-24 16:49:05.244510489 -0700
@@ -407,16 +407,9 @@ impl<'cfg> PackageSet<'cfg> {
         sources: SourceMap<'cfg>,
         config: &'cfg Config,
     ) -> CargoResult<PackageSet<'cfg>> {
-        // We've enabled the `http2` feature of `curl` in Cargo, so treat
-        // failures here as fatal as it would indicate a build-time problem.
-        let mut multi = Multi::new();
-        let multiplexing = config.http_config()?.multiplexing.unwrap_or(true);
-        multi
-            .pipelining(false, multiplexing)
-            .with_context(|| "failed to enable multiplexing/pipelining in curl")?;
-
-        // let's not flood crates.io with connections
-        multi.set_max_host_connections(2)?;
+        // Multiplexing is disabled because the system libcurl doesn't support it.
+        let multi = Multi::new();
+        let multiplexing = false;
 
         Ok(PackageSet {
             packages: package_ids
--- rustc-beta-src/src/tools/cargo/src/cargo/sources/registry/http_remote.rs.orig	2023-05-24 16:49:05.245510468 -0700
+++ rustc-beta-src/src/tools/cargo/src/cargo/sources/registry/http_remote.rs	2023-05-24 16:51:57.916900146 -0700
@@ -229,16 +229,8 @@ impl<'cfg> HttpRegistry<'cfg> {
         }
         self.fetch_started = true;
 
-        // We've enabled the `http2` feature of `curl` in Cargo, so treat
-        // failures here as fatal as it would indicate a build-time problem.
-        self.multiplexing = self.config.http_config()?.multiplexing.unwrap_or(true);
-
-        self.multi
-            .pipelining(false, self.multiplexing)
-            .with_context(|| "failed to enable multiplexing/pipelining in curl")?;
-
-        // let's not flood the server with connections
-        self.multi.set_max_host_connections(2)?;
+        // Multiplexing is disabled because the system libcurl doesn't support it.
+        self.multiplexing = false;
 
         if !self.quiet {
             self.config
--- rustc-beta-src/src/tools/cargo/src/cargo/util/network/mod.rs.orig	2023-05-19 19:05:42.000000000 -0700
+++ rustc-beta-src/src/tools/cargo/src/cargo/util/network/mod.rs	2023-05-24 16:49:05.245510468 -0700
@@ -25,7 +25,7 @@ impl<T> PollExt<T> for Poll<T> {
 macro_rules! try_old_curl {
     ($e:expr, $msg:expr) => {
         let result = $e;
-        if cfg!(target_os = "macos") {
+        if cfg!(any(target_os = "linux", target_os = "macos")) {
             if let Err(e) = result {
                 warn!("ignoring libcurl {} error: {}", $msg, e);
             }