diff -ruN libbpf-rs-0.16.0/Cargo.toml libbpf-rs-0.16.0-downgrade-to-0.4.0/Cargo.toml
--- libbpf-rs-0.16.0/Cargo.toml	1969-12-31 16:00:01.000000000 -0800
+++ libbpf-rs-0.16.0-downgrade-to-0.4.0/Cargo.toml	2022-02-15 16:15:59.255663607 -0800
@@ -27,7 +27,7 @@
 version = "1.4"
 
 [dependencies.libbpf-sys]
-version = "0.6.0-1"
+version = "0.4.0-2"
 
 [dependencies.nix]
 version = "0.22"
diff -ruN libbpf-rs-0.16.0/src/object.rs libbpf-rs-0.16.0-downgrade-to-0.4.0/src/object.rs
--- libbpf-rs-0.16.0/src/object.rs	1973-11-29 13:33:09.000000000 -0800
+++ libbpf-rs-0.16.0-downgrade-to-0.4.0/src/object.rs	2022-02-15 16:15:43.089602484 -0800
@@ -53,9 +53,6 @@
             pin_root_path: ptr::null(),
             attach_prog_fd: 0,
             kconfig: ptr::null(),
-            btf_custom_path: ptr::null(),
-            __bindgen_padding_0: <[u8; 6]>::default(),
-            __bindgen_padding_1: <[u8; 4]>::default(),
         }
     }
 
diff -ruN libbpf-rs-0.16.0/src/perf_buffer.rs libbpf-rs-0.16.0-downgrade-to-0.4.0/src/perf_buffer.rs
--- libbpf-rs-0.16.0/src/perf_buffer.rs	1973-11-29 13:33:09.000000000 -0800
+++ libbpf-rs-0.16.0-downgrade-to-0.4.0/src/perf_buffer.rs	2022-02-15 16:20:53.001774261 -0800
@@ -106,15 +106,14 @@
             lost_cb: self.lost_cb,
         }));
 
+        let opts = libbpf_sys::perf_buffer_opts {
+            sample_cb: c_sample_cb,
+            lost_cb: c_lost_cb,
+            ctx: callback_struct_ptr as *mut _,
+        };
+
         let ptr = unsafe {
-            libbpf_sys::perf_buffer__new(
-                self.map.fd(),
-                self.pages as libbpf_sys::size_t,
-                c_sample_cb,
-                c_lost_cb,
-                callback_struct_ptr as *mut _,
-                std::ptr::null(),
-            )
+            libbpf_sys::perf_buffer__new(self.map.fd(), self.pages as libbpf_sys::size_t, &opts)
         };
         let err = unsafe { libbpf_sys::libbpf_get_error(ptr as *const _) };
         if err != 0 {