diff --git a/build/fbcode_builder/getdeps/builder.py b/build/fbcode_builder/getdeps/builder.py
index 3ed744bba..a8a7c15a0 100644
--- a/build/fbcode_builder/getdeps/builder.py
+++ b/build/fbcode_builder/getdeps/builder.py
@@ -799,6 +799,7 @@ class Boost(BuilderBase):
         self.b2_args = b2_args
 
     def _build(self, install_dirs, reconfigure):
+        env = self._compute_env(install_dirs)
         linkage = ["static"]
         if self.build_opts.is_windows():
             linkage.append("shared")
@@ -814,12 +815,14 @@ class Boost(BuilderBase):
         for link in linkage:
             if self.build_opts.is_windows():
                 bootstrap = os.path.join(self.src_dir, "bootstrap.bat")
-                self._run_cmd([bootstrap], cwd=self.src_dir)
+                self._run_cmd([bootstrap], cwd=self.src_dir, env=env)
                 args += ["address-model=64"]
             else:
                 bootstrap = os.path.join(self.src_dir, "bootstrap.sh")
                 self._run_cmd(
-                    [bootstrap, "--prefix=%s" % self.inst_dir], cwd=self.src_dir
+                    [bootstrap, "--prefix=%s" % self.inst_dir],
+                    cwd=self.src_dir,
+                    env=env,
                 )
 
             b2 = os.path.join(self.src_dir, "b2")
@@ -843,6 +846,7 @@ class Boost(BuilderBase):
                     "install",
                 ],
                 cwd=self.src_dir,
+                env=env,
             )
 
 
diff --git a/build/fbcode_builder/getdeps/buildopts.py b/build/fbcode_builder/getdeps/buildopts.py
index ec7f7b0be..2c7cad9aa 100644
--- a/build/fbcode_builder/getdeps/buildopts.py
+++ b/build/fbcode_builder/getdeps/buildopts.py
@@ -187,6 +187,12 @@ class BuildOptions(object):
         env["GETDEPS_BUILD_DIR"] = os.path.join(self.scratch_dir, "build")
         env["GETDEPS_INSTALL_DIR"] = self.install_dir
 
+        # On macOS we need to set `SDKROOT` when we use clang for system
+        # header files.
+        if self.is_darwin() and "SDKROOT" not in env:
+            sdkroot = subprocess.check_output(["xcrun", "--show-sdk-path"])
+            env["SDKROOT"] = sdkroot.decode().strip()
+
         if self.fbsource_dir:
             env["YARN_YARN_OFFLINE_MIRROR"] = os.path.join(
                 self.fbsource_dir, "xplat/third-party/yarn/offline-mirror"