Check PKG_CONFIG for pkg-config executable

build.rs

@@ -155,7 +155,11 @@ fn main() {
 
     let (compiler, mut cflags) = if vendored_libbpf || vendored_libelf || vendored_zlib {
         pkg_check("make");
-        pkg_check("pkg-config");
+        pkg_check(
+            std::env::var("PKG_CONFIG")
+                .as_deref()
+                .unwrap_or("pkg-config"),
+        );
 
         let compiler = cc::Build::new().try_get_compiler().expect(
             "a C compiler is required to compile libbpf-sys using the vendored copy of libbpf",
@@ -246,7 +250,7 @@ fn open_lockable(path: &Path) -> io::Result<File> {
             // with write permissions. So just open for reading and hope
             // for the best.
             File::open(path)
-        },
+        }
         e @ Err(..) => e,
     }
 }