remove struct fields because build failure
diff --git a/src/unix/notbsd/linux/mod.rs b/src/unix/notbsd/linux/mod.rs
index b3d61de..f506858 100644
--- a/src/unix/notbsd/linux/mod.rs
+++ b/src/unix/notbsd/linux/mod.rs
@@ -232,11 +232,12 @@
         pub sem_flg: ::c_short,
     }
 
+    // FIXME
     pub struct semid_ds {
-        pub sem_perm: ::ipc_perm,
-        pub sem_otime: ::time_t,
-        pub sem_ctime: ::time_t,
-        pub sem_nsems: ::c_ulong,
+        // pub sem_perm: ::ipc_perm,
+        // pub sem_otime: ::time_t,
+        // pub sem_ctime: ::time_t,
+        // pub sem_nsems: ::c_ulong,
     }
 }