--- a/vendor/pkg-config/src/lib.rs
+++ b/vendor/pkg-config/src/lib.rs
@@ -9,8 +9,6 @@
 //! A number of environment variables are available to globally configure how
 //! this crate will invoke `pkg-config`:
 //!
-//! * `PKG_CONFIG_ALLOW_CROSS` - if this variable is not set, then `pkg-config`
-//!   will automatically be disabled for all cross compiles.
 //! * `FOO_NO_PKG_CONFIG` - if set, this will disable running `pkg-config` when
 //!   probing for the library named `foo`.
 //!
@@ -106,9 +104,8 @@
     /// Contains the name of the responsible environment variable.
     EnvNoPkgConfig(String),
 
-    /// Cross compilation detected.
-    ///
-    /// Override with `PKG_CONFIG_ALLOW_CROSS=1`.
+    /// Cross compilation detected. Kept for compatibility;
+    /// the Debian package never emits this.
     CrossCompilation,
 
     /// Failed to run `pkg-config`.
@@ -132,11 +129,6 @@
     fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
         match *self {
             Error::EnvNoPkgConfig(ref name) => write!(f, "Aborted because {} is set", name),
-            Error::CrossCompilation => write!(
-                f,
-                "Cross compilation detected. \
-                 Use PKG_CONFIG_ALLOW_CROSS=1 to override"
-            ),
             Error::Command {
                 ref command,
                 ref cause,
@@ -160,7 +152,7 @@
                 }
                 Ok(())
             }
-            Error::__Nonexhaustive => panic!(),
+            Error::CrossCompilation | Error::__Nonexhaustive => panic!(),
         }
     }
 }
@@ -321,6 +313,8 @@
         if host == target {
             return true;
         }
+        // always enable PKG_CONFIG_ALLOW_CROSS override in Debian
+        return true;
 
         // pkg-config may not be aware of cross-compilation, and require
         // a wrapper script that sets up platform-specific prefixes.
@@ -380,7 +374,11 @@
     fn command(&self, name: &str, args: &[&str]) -> Command {
         let exe = self
             .env_var_os("PKG_CONFIG")
-            .unwrap_or_else(|| OsString::from("pkg-config"));
+            .unwrap_or_else(|| {
+                self.env_var_os("DEB_HOST_GNU_TYPE")
+                    .map(|mut t| { t.push(OsString::from("-pkg-config")); t })
+                    .unwrap_or_else(|| OsString::from("pkg-config"))
+            });
         let mut cmd = Command::new(exe);
         if self.is_static(name) {
             cmd.arg("--static");
--- a/vendor/pkg-config/tests/test.rs
+++ b/vendor/pkg-config/tests/test.rs
@@ -34,7 +34,6 @@
     pkg_config::probe_library(name)
 }
 
-#[test]
 fn cross_disabled() {
     let _g = LOCK.lock();
     reset();
@@ -46,7 +45,6 @@
     }
 }
 
-#[test]
 fn cross_enabled() {
     let _g = LOCK.lock();
     reset();