diff --git a/src/lib.rs b/src/lib.rs
index e3a2b98b0..7101cf50c 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -59,7 +59,7 @@
 use std::collections::HashMap;
 use std::env;
 use std::ffi::{OsStr, OsString};
-use std::fmt::{self, Display};
+use std::fmt::{self, Display, Formatter};
 use std::fs;
 use std::io::{self, BufRead, BufReader, Read, Write};
 use std::path::{Component, Path, PathBuf};
@@ -168,7 +168,7 @@ impl From<io::Error> for Error {
 }
 
 impl Display for Error {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         write!(f, "{:?}: {}", self.kind, self.message)
     }
 }
@@ -1522,7 +1522,7 @@ impl Build {
                     cmd.push_opt_unless_duplicate("-DANDROID".into());
                 }
 
-                if !target.contains("apple-ios") {
+                if !target.contains("apple-ios") && !target.contains("apple-watchos") {
                     cmd.push_cc_arg("-ffunction-sections".into());
                     cmd.push_cc_arg("-fdata-sections".into());
                 }
@@ -1590,6 +1590,20 @@ impl Build {
                                 .into(),
                             );
                         }
+                    } else if target.contains("watchos-sim") {
+                        if let Some(arch) =
+                            map_darwin_target_from_rust_to_compiler_architecture(target)
+                        {
+                            let deployment_target = env::var("WATCHOS_DEPLOYMENT_TARGET")
+                                .unwrap_or_else(|_| "5.0".into());
+                            cmd.args.push(
+                                format!(
+                                    "--target={}-apple-watchos{}-simulator",
+                                    arch, deployment_target
+                                )
+                                .into(),
+                            );
+                        }
                     } else if target.starts_with("riscv64gc-") {
                         cmd.args.push(
                             format!("--target={}", target.replace("riscv64gc", "riscv64")).into(),
@@ -1849,8 +1863,8 @@ impl Build {
             }
         }
 
-        if target.contains("apple-ios") {
-            self.ios_flags(cmd)?;
+        if target.contains("apple-ios") || target.contains("apple-watchos") {
+            self.ios_watchos_flags(cmd)?;
         }
 
         if self.static_flag.unwrap_or(false) {
@@ -2043,18 +2057,37 @@ impl Build {
         Ok(())
     }
 
-    fn ios_flags(&self, cmd: &mut Tool) -> Result<(), Error> {
+    fn ios_watchos_flags(&self, cmd: &mut Tool) -> Result<(), Error> {
         enum ArchSpec {
             Device(&'static str),
             Simulator(&'static str),
             Catalyst(&'static str),
         }
 
+        enum Os {
+            Ios,
+            WatchOs,
+        }
+        impl Display for Os {
+            fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
+                match self {
+                    Os::Ios => f.write_str("iOS"),
+                    Os::WatchOs => f.write_str("WatchOS"),
+                }
+            }
+        }
+
         let target = self.get_target()?;
+        let os = if target.contains("-watchos") {
+            Os::WatchOs
+        } else {
+            Os::Ios
+        };
+
         let arch = target.split('-').nth(0).ok_or_else(|| {
             Error::new(
                 ErrorKind::ArchitectureInvalid,
-                "Unknown architecture for iOS target.",
+                format!("Unknown architecture for {} target.", os).as_str(),
             )
         })?;
 
@@ -2083,6 +2116,7 @@ impl Build {
         } else if is_sim {
             match arch {
                 "arm64" | "aarch64" => ArchSpec::Simulator("-arch arm64"),
+                "x86_64" => ArchSpec::Simulator("-m64"),
                 _ => {
                     return Err(Error::new(
                         ErrorKind::ArchitectureInvalid,
@@ -2093,42 +2127,54 @@ impl Build {
         } else {
             match arch {
                 "arm" | "armv7" | "thumbv7" => ArchSpec::Device("armv7"),
+                "armv7k" => ArchSpec::Device("armv7k"),
                 "armv7s" | "thumbv7s" => ArchSpec::Device("armv7s"),
                 "arm64e" => ArchSpec::Device("arm64e"),
                 "arm64" | "aarch64" => ArchSpec::Device("arm64"),
+                "arm64_32" => ArchSpec::Device("arm64_32"),
                 "i386" | "i686" => ArchSpec::Simulator("-m32"),
                 "x86_64" => ArchSpec::Simulator("-m64"),
                 _ => {
                     return Err(Error::new(
                         ErrorKind::ArchitectureInvalid,
-                        "Unknown architecture for iOS target.",
+                        format!("Unknown architecture for {} target.", os).as_str(),
                     ));
                 }
             }
         };
 
-        let min_version =
-            std::env::var("IPHONEOS_DEPLOYMENT_TARGET").unwrap_or_else(|_| "7.0".into());
+        let (sdk_prefix, sim_prefix, min_version) = match os {
+            Os::Ios => (
+                "iphone",
+                "ios-",
+                std::env::var("IPHONEOS_DEPLOYMENT_TARGET").unwrap_or_else(|_| "7.0".into()),
+            ),
+            Os::WatchOs => (
+                "watch",
+                "watch",
+                std::env::var("WATCHOS_DEPLOYMENT_TARGET").unwrap_or_else(|_| "2.0".into()),
+            ),
+        };
 
         let sdk = match arch {
             ArchSpec::Device(arch) => {
                 cmd.args.push("-arch".into());
                 cmd.args.push(arch.into());
                 cmd.args
-                    .push(format!("-miphoneos-version-min={}", min_version).into());
-                "iphoneos"
+                    .push(format!("-m{}os-version-min={}", sdk_prefix, min_version).into());
+                format!("{}os", sdk_prefix)
             }
             ArchSpec::Simulator(arch) => {
                 cmd.args.push(arch.into());
                 cmd.args
-                    .push(format!("-mios-simulator-version-min={}", min_version).into());
-                "iphonesimulator"
+                    .push(format!("-m{}simulator-version-min={}", sim_prefix, min_version).into());
+                format!("{}simulator", sdk_prefix)
             }
-            ArchSpec::Catalyst(_) => "macosx",
+            ArchSpec::Catalyst(_) => "macosx".to_owned(),
         };
 
-        self.print(&format!("Detecting iOS SDK path for {}", sdk));
-        let sdk_path = self.apple_sdk_root(sdk)?;
+        self.print(&format!("Detecting {} SDK path for {}", os, sdk));
+        let sdk_path = self.apple_sdk_root(sdk.as_str())?;
         cmd.args.push("-isysroot".into());
         cmd.args.push(sdk_path);
         cmd.args.push("-fembed-bitcode".into());
@@ -2230,6 +2276,8 @@ impl Build {
                     }
                 } else if target.contains("apple-ios") {
                     clang.to_string()
+                } else if target.contains("apple-watchos") {
+                    clang.to_string()
                 } else if target.contains("android") {
                     autodetect_android_compiler(&target, &host, gnu, clang)
                 } else if target.contains("cloudabi") {
@@ -2806,7 +2854,7 @@ impl Build {
             Err(_) => {
                 return Err(Error::new(
                     ErrorKind::IOError,
-                    "Unable to determine iOS SDK path.",
+                    "Unable to determine Apple SDK path.",
                 ));
             }
         };