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--- rustc-beta-src/Cargo.lock.orig	2022-06-22 14:03:26.309745526 -0700
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+++ rustc-beta-src/Cargo.lock	2022-06-22 14:03:26.310745506 -0700
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@@ -990,7 +990,6 @@
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 dependencies = [
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  "cc",
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  "libc",
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- "libnghttp2-sys",
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  "libz-sys",
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  "openssl-sys",
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  "pkg-config",
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@@ -2101,16 +2100,6 @@
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 checksum = "7fc7aa29613bd6a620df431842069224d8bc9011086b1db4c0e0cd47fa03ec9a"
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 [[package]]
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-name = "libnghttp2-sys"
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-version = "0.1.4+1.41.0"
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-source = "registry+https://github.com/rust-lang/crates.io-index"
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-checksum = "03624ec6df166e79e139a2310ca213283d6b3c30810c54844f307086d4488df1"
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-dependencies = [
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- "cc",
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- "libc",
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-]
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-
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-[[package]]
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 name = "libz-sys"
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 version = "1.1.3"
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 source = "registry+https://github.com/rust-lang/crates.io-index"
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--- rustc-beta-src/src/tools/cargo/Cargo.toml.orig	2022-06-22 14:03:26.310745506 -0700
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+++ rustc-beta-src/src/tools/cargo/Cargo.toml	2022-06-22 14:04:22.058596881 -0700
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@@ -22,7 +22,7 @@
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 cargo-util = { path = "crates/cargo-util", version = "0.1.3" }
6a704c
 crates-io = { path = "crates/crates-io", version = "0.34.0" }
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 crossbeam-utils = "0.8"
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-curl = { version = "0.4.41", features = ["http2"] }
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+curl = { version = "0.4.41", features = [] }
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 curl-sys = "0.4.50"
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 env_logger = "0.9.0"
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 pretty_env_logger = { version = "0.4", optional = true }
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--- rustc-beta-src/src/tools/cargo/src/cargo/sources/registry/http_remote.rs.orig	2022-06-13 07:34:54.000000000 -0700
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+++ rustc-beta-src/src/tools/cargo/src/cargo/sources/registry/http_remote.rs	2022-06-22 14:03:26.311745485 -0700
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@@ -183,16 +183,8 @@
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         }
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         self.fetch_started = true;
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-        // We've enabled the `http2` feature of `curl` in Cargo, so treat
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-        // failures here as fatal as it would indicate a build-time problem.
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-        self.multiplexing = self.config.http_config()?.multiplexing.unwrap_or(true);
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-
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-        self.multi
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-            .pipelining(false, self.multiplexing)
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-            .with_context(|| "failed to enable multiplexing/pipelining in curl")?;
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-
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-        // let's not flood the server with connections
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-        self.multi.set_max_host_connections(2)?;
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+        // Multiplexing is disabled because the system libcurl doesn't support it.
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+        self.multiplexing = false;
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         self.config
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             .shell()
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--- rustc-beta-src/src/tools/cargo/src/cargo/core/package.rs.orig	2022-06-13 07:34:54.000000000 -0700
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+++ rustc-beta-src/src/tools/cargo/src/cargo/core/package.rs	2022-06-22 14:03:26.311745485 -0700
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@@ -403,16 +403,9 @@
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         sources: SourceMap<'cfg>,
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         config: &'cfg Config,
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     ) -> CargoResult<PackageSet<'cfg>> {
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-        // We've enabled the `http2` feature of `curl` in Cargo, so treat
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-        // failures here as fatal as it would indicate a build-time problem.
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-        let mut multi = Multi::new();
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-        let multiplexing = config.http_config()?.multiplexing.unwrap_or(true);
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-        multi
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-            .pipelining(false, multiplexing)
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-            .with_context(|| "failed to enable multiplexing/pipelining in curl")?;
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-
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-        // let's not flood crates.io with connections
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-        multi.set_max_host_connections(2)?;
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+        // Multiplexing is disabled because the system libcurl doesn't support it.
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+        let multi = Multi::new();
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+        let multiplexing = false;
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         Ok(PackageSet {
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             packages: package_ids
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@@ -658,7 +651,7 @@
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 macro_rules! try_old_curl {
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     ($e:expr, $msg:expr) => {
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         let result = $e;
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-        if cfg!(target_os = "macos") {
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+        if cfg!(any(target_os = "linux", target_os = "macos")) {
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             if let Err(e) = result {
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                 warn!("ignoring libcurl {} error: {}", $msg, e);
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             }