diff --git a/build.rs b/build.rs
index df4ef93c7230383698db19c6da9f29cef51a6016..d6975572b730cb6104532cb0afd8becfd2cc17f6 100644
--- a/build.rs
+++ b/build.rs
@@ -102,6 +102,22 @@ fn locate_llvm_config() -> Option<PathBuf> {
         }
     }
 
+    // On FreeBSD, LLVM binary packages install to /usr/local/llvm{version} (where version is "21",
+    // "20" and so forth down to 11 as the earliest available as of 2025-11-13) and aren't on PATH.
+    // Search for one of those if nothing else worked, newest first.
+    if target_os_is("freebsd") {
+        let mut prefix = PathBuf::from("/usr/local/");
+
+        for version in (11..=(CRATE_VERSION.major / 10)).rev() {
+            prefix.push(format!("llvm{version}/bin"));
+            if let Some(x) = llvm_compatible_binary_name(&prefix) {
+                return Some(x);
+            }
+            prefix.pop();
+            prefix.pop();
+        }
+    }
+
     None
 }