--- rustc-beta-src/src/tools/cargo/Cargo.lock.orig	2023-08-21 11:00:15.341608892 -0700
+++ rustc-beta-src/src/tools/cargo/Cargo.lock	2023-08-21 11:00:46.074984901 -0700
@@ -743,7 +743,6 @@
 dependencies = [
  "cc",
  "libc",
- "libnghttp2-sys",
  "libz-sys",
  "openssl-sys",
  "pkg-config",
@@ -2011,16 +2010,6 @@
 checksum = "f7012b1bbb0719e1097c47611d3898568c546d597c2e74d66f6087edd5233ff4"
 
 [[package]]
-name = "libnghttp2-sys"
-version = "0.1.7+1.45.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "57ed28aba195b38d5ff02b9170cbff627e336a20925e43b4945390401c5dc93f"
-dependencies = [
- "cc",
- "libc",
-]
-
-[[package]]
 name = "libz-sys"
 version = "1.1.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
--- rustc-beta-src/src/tools/cargo/Cargo.toml.orig	2023-08-21 11:00:15.341608892 -0700
+++ rustc-beta-src/src/tools/cargo/Cargo.toml	2023-08-21 11:00:15.342608871 -0700
@@ -118,7 +118,7 @@
 cargo-util.workspace = true
 clap = { workspace = true, features = ["wrap_help"] }
 crates-io.workspace = true
-curl = { workspace = true, features = ["http2"] }
+curl = { workspace = true, features = [] }
 curl-sys.workspace = true
 env_logger.workspace = true
 filetime.workspace = true
--- rustc-beta-src/src/tools/cargo/src/cargo/core/package.rs.orig	2023-08-17 20:58:39.000000000 -0700
+++ rustc-beta-src/src/tools/cargo/src/cargo/core/package.rs	2023-08-21 11:00:15.343608851 -0700
@@ -408,16 +408,9 @@
         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	2023-08-17 20:58:39.000000000 -0700
+++ rustc-beta-src/src/tools/cargo/src/cargo/sources/registry/http_remote.rs	2023-08-21 11:00:15.343608851 -0700
@@ -250,16 +250,8 @@
         }
         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	2023-08-21 11:00:15.343608851 -0700
+++ rustc-beta-src/src/tools/cargo/src/cargo/util/network/mod.rs	2023-08-21 11:02:01.969443986 -0700
@@ -27,7 +27,7 @@
 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 {
                 ::log::warn!("ignoring libcurl {} error: {}", $msg, e);
             }