diff --git a/libc-test/build.rs b/libc-test/build.rs
index d703e33..1c71204 100644
--- a/libc-test/build.rs
+++ b/libc-test/build.rs
@@ -402,7 +402,9 @@
         // just insert some padding.
         (struct_ == "siginfo_t" && field == "_pad") ||
         // musl names this __dummy1 but it's still there
-        (musl && struct_ == "glob_t" && field == "gl_flags")
+        (musl && struct_ == "glob_t" && field == "gl_flags") ||
+        // musl seems to define this as an *anonymous* bitfield
+        (musl && struct_ == "statvfs" && field == "__f_unused")
     });
 
     cfg.fn_cname(move |name, cname| {
diff --git a/src/unix/notbsd/android/mod.rs b/src/unix/notbsd/android/mod.rs
index 25558d3..c616958 100644
--- a/src/unix/notbsd/android/mod.rs
+++ b/src/unix/notbsd/android/mod.rs
@@ -23,6 +23,7 @@
 pub type fsfilcnt_t = ::c_ulong;
 pub type fsblkcnt_t = ::c_ulong;
 pub type nfds_t = ::c_uint;
+pub type rlim_t = c_ulong;
 
 s! {
     pub struct stat {
@@ -468,6 +469,8 @@
 pub const F_GETLK: ::c_int = 5;
 pub const F_GETOWN: ::c_int = 9;
 pub const F_SETOWN: ::c_int = 8;
+pub const F_SETLK: ::c_int = 6;
+pub const F_SETLKW: ::c_int = 7;
 
 pub const TCGETS: ::c_int = 0x5401;
 pub const TCSETS: ::c_int = 0x5402;
diff --git a/src/unix/notbsd/linux/mips.rs b/src/unix/notbsd/linux/mips.rs
index 00a2235..b809a7f 100644
--- a/src/unix/notbsd/linux/mips.rs
+++ b/src/unix/notbsd/linux/mips.rs
@@ -10,6 +10,9 @@
 pub type blkcnt_t = i32;
 pub type blksize_t = i32;
 pub type nlink_t = u32;
+pub type fsblkcnt_t = ::c_ulong;
+pub type fsfilcnt_t = ::c_ulong;
+pub type rlim_t = c_ulong;
 
 s! {
     pub struct stat {
@@ -428,6 +431,8 @@
 pub const F_GETLK: ::c_int = 14;
 pub const F_GETOWN: ::c_int = 23;
 pub const F_SETOWN: ::c_int = 24;
+pub const F_SETLK: ::c_int = 6;
+pub const F_SETLKW: ::c_int = 7;
 
 pub const SFD_NONBLOCK: ::c_int = 0x80;
 
diff --git a/src/unix/notbsd/linux/mod.rs b/src/unix/notbsd/linux/mod.rs
index e8dec9c..3515c63 100644
--- a/src/unix/notbsd/linux/mod.rs
+++ b/src/unix/notbsd/linux/mod.rs
@@ -9,8 +9,6 @@
 pub type off64_t = i64;
 pub type blkcnt64_t = i64;
 pub type rlim64_t = u64;
-pub type fsblkcnt_t = ::c_ulong;
-pub type fsfilcnt_t = ::c_ulong;
 pub type key_t = ::c_int;
 pub type shmatt_t = ::c_ulong;
 pub type mqd_t = ::c_int;
diff --git a/src/unix/notbsd/linux/musl/b32/arm.rs b/src/unix/notbsd/linux/musl/b32/arm.rs
new file mode 100644
index 0000000..1a92e3b
--- /dev/null
+++ b/src/unix/notbsd/linux/musl/b32/arm.rs
@@ -0,0 +1,2 @@
+pub type c_char = u8;
+pub type wchar_t = u32;
diff --git a/src/unix/notbsd/linux/musl/b32/asmjs.rs b/src/unix/notbsd/linux/musl/b32/asmjs.rs
new file mode 100644
index 0000000..1a92e3b
--- /dev/null
+++ b/src/unix/notbsd/linux/musl/b32/asmjs.rs
@@ -0,0 +1,2 @@
+pub type c_char = u8;
+pub type wchar_t = u32;
diff --git a/src/unix/notbsd/linux/musl/b32/mod.rs b/src/unix/notbsd/linux/musl/b32/mod.rs
new file mode 100644
index 0000000..1bbf3b1
--- /dev/null
+++ b/src/unix/notbsd/linux/musl/b32/mod.rs
@@ -0,0 +1,97 @@
+pub type c_long = i32;
+pub type c_ulong = u32;
+
+pub const __SIZEOF_PTHREAD_RWLOCK_T: usize = 32;
+pub const __SIZEOF_PTHREAD_MUTEX_T: usize = 24;
+
+pub const F_GETLK: ::c_int = 12;
+pub const F_SETLK: ::c_int = 13;
+pub const F_SETLKW: ::c_int = 14;
+
+
+s! {
+    pub struct stat {
+        pub st_dev: ::dev_t,
+        __st_dev_padding: ::c_int,
+        __st_ino_truncated: ::c_long,
+        pub st_mode: ::mode_t,
+        pub st_nlink: ::nlink_t,
+        pub st_uid: ::uid_t,
+        pub st_gid: ::gid_t,
+        pub st_rdev: ::dev_t,
+        __st_rdev_padding: ::c_int,
+        pub st_size: ::off_t,
+        pub st_blksize: ::blksize_t,
+        pub st_blocks: ::blkcnt_t,
+        pub st_atim: ::timespec,
+        pub st_mtim: ::timespec,
+        pub st_ctim: ::timespec,
+        pub st_ino: ::ino_t,
+    }
+
+    pub struct stat64 {
+        pub st_dev: ::dev_t,
+        __st_dev_padding: ::c_int,
+        __st_ino_truncated: ::c_long,
+        pub st_mode: ::mode_t,
+        pub st_nlink: ::nlink_t,
+        pub st_uid: ::uid_t,
+        pub st_gid: ::gid_t,
+        pub st_rdev: ::dev_t,
+        __st_rdev_padding: ::c_int,
+        pub st_size: ::off_t,
+        pub st_blksize: ::blksize_t,
+        pub st_blocks: ::blkcnt_t,
+        pub st_atim: ::timespec,
+        pub st_mtim: ::timespec,
+        pub st_ctim: ::timespec,
+        pub st_ino: ::ino_t,
+    }
+
+    pub struct pthread_attr_t {
+        __size: [u32; 9]
+    }
+
+    pub struct sigset_t {
+        __val: [::c_ulong; 32],
+    }
+
+    pub struct shmid_ds {
+        pub shm_perm: ::ipc_perm,
+        pub shm_segsz: ::size_t,
+        pub shm_atime: ::time_t,
+        __unused1: ::c_int,
+        pub shm_dtime: ::time_t,
+        __unused2: ::c_int,
+        pub shm_ctime: ::time_t,
+        __unused3: ::c_int,
+        pub shm_cpid: ::pid_t,
+        pub shm_lpid: ::pid_t,
+        pub shm_nattch: ::c_ulong,
+        __pad1: ::c_ulong,
+        __pad2: ::c_ulong,
+    }
+
+    pub struct msghdr {
+        pub msg_name: *mut ::c_void,
+        pub msg_namelen: ::socklen_t,
+        pub msg_iov: *mut ::iovec,
+        pub msg_iovlen: ::c_int,
+        pub msg_control: *mut ::c_void,
+        pub msg_controllen: ::socklen_t,
+        pub msg_flags: ::c_int,
+    }
+}
+
+cfg_if! {
+    if #[cfg(any(target_arch = "x86"))] {
+        mod x86;
+        pub use self::x86::*;
+    } else if #[cfg(any(target_arch = "arm"))] {
+        mod arm;
+        pub use self::arm::*;
+    } else if #[cfg(any(target_arch = "asmjs"))] {
+        mod asmjs;
+        pub use self::asmjs::*;
+    } else { }
+}
diff --git a/src/unix/notbsd/linux/musl/b32/x86.rs b/src/unix/notbsd/linux/musl/b32/x86.rs
new file mode 100644
index 0000000..76ec3ce
--- /dev/null
+++ b/src/unix/notbsd/linux/musl/b32/x86.rs
@@ -0,0 +1,2 @@
+pub type c_char = i8;
+pub type wchar_t = i32;
diff --git a/src/unix/notbsd/linux/musl/b64/mod.rs b/src/unix/notbsd/linux/musl/b64/mod.rs
new file mode 100644
index 0000000..426c63c
--- /dev/null
+++ b/src/unix/notbsd/linux/musl/b64/mod.rs
@@ -0,0 +1,88 @@
+pub type c_char = i8;
+pub type wchar_t = i32;
+pub type c_long = i64;
+pub type c_ulong = u64;
+
+pub const __SIZEOF_PTHREAD_RWLOCK_T: usize = 56;
+pub const __SIZEOF_PTHREAD_MUTEX_T: usize = 40;
+
+pub const F_GETLK: ::c_int = 5;
+pub const F_SETLK: ::c_int = 6;
+pub const F_SETLKW: ::c_int = 7;
+
+s! {
+    pub struct stat {
+        pub st_dev: ::dev_t,
+        pub st_ino: ::ino_t,
+        pub st_nlink: ::nlink_t,
+        pub st_mode: ::mode_t,
+        pub st_uid: ::uid_t,
+        pub st_gid: ::gid_t,
+        __pad0: ::c_int,
+        pub st_rdev: ::dev_t,
+        pub st_size: ::off_t,
+        pub st_blksize: ::blksize_t,
+        pub st_blocks: ::blkcnt_t,
+        pub st_atime: ::time_t,
+        pub st_atime_nsec: ::c_long,
+        pub st_mtime: ::time_t,
+        pub st_mtime_nsec: ::c_long,
+        pub st_ctime: ::time_t,
+        pub st_ctime_nsec: ::c_long,
+        __unused: [::c_long; 3],
+    }
+
+    pub struct stat64 {
+        pub st_dev: ::dev_t,
+        pub st_ino: ::ino64_t,
+        pub st_nlink: ::nlink_t,
+        pub st_mode: ::mode_t,
+        pub st_uid: ::uid_t,
+        pub st_gid: ::gid_t,
+        __pad0: ::c_int,
+        pub st_rdev: ::dev_t,
+        pub st_size: ::off_t,
+        pub st_blksize: ::blksize_t,
+        pub st_blocks: ::blkcnt64_t,
+        pub st_atime: ::time_t,
+        pub st_atime_nsec: ::c_long,
+        pub st_mtime: ::time_t,
+        pub st_mtime_nsec: ::c_long,
+        pub st_ctime: ::time_t,
+        pub st_ctime_nsec: ::c_long,
+        __reserved: [::c_long; 3],
+    }
+
+    pub struct pthread_attr_t {
+        __size: [u64; 7]
+    }
+
+    pub struct sigset_t {
+        __val: [::c_ulong; 16],
+    }
+
+    pub struct shmid_ds {
+        pub shm_perm: ::ipc_perm,
+        pub shm_segsz: ::size_t,
+        pub shm_atime: ::time_t,
+        pub shm_dtime: ::time_t,
+        pub shm_ctime: ::time_t,
+        pub shm_cpid: ::pid_t,
+        pub shm_lpid: ::pid_t,
+        pub shm_nattch: ::c_ulong,
+        __pad1: ::c_ulong,
+        __pad2: ::c_ulong,
+    }
+
+    pub struct msghdr {
+        pub msg_name: *mut ::c_void,
+        pub msg_namelen: ::socklen_t,
+        pub msg_iov: *mut ::iovec,
+        pub msg_iovlen: ::c_int,
+        __pad1: ::c_int,
+        pub msg_control: *mut ::c_void,
+        pub msg_controllen: ::socklen_t,
+        __pad2: ::socklen_t,
+        pub msg_flags: ::c_int,
+    }
+}
diff --git a/src/unix/notbsd/linux/musl.rs b/src/unix/notbsd/linux/musl/mod.rs
similarity index 83%
rename from src/unix/notbsd/linux/musl.rs
rename to src/unix/notbsd/linux/musl/mod.rs
index 30a7f40..5575d33 100644
--- a/src/unix/notbsd/linux/musl.rs
+++ b/src/unix/notbsd/linux/musl/mod.rs
@@ -1,67 +1,17 @@
-pub type c_long = i64;
-pub type c_ulong = u64;
-pub type clock_t = i64;
-pub type time_t = i64;
-pub type suseconds_t = i64;
+pub type clock_t = c_long;
+pub type time_t = c_long;
+pub type suseconds_t = c_long;
 pub type ino_t = u64;
 pub type off_t = i64;
 pub type blkcnt_t = i64;
-pub type c_char = i8;
-pub type wchar_t = i32;
-pub type nlink_t = u64;
-pub type blksize_t = i64;
+
+pub type nlink_t = usize;
+pub type blksize_t = c_long;
+pub type fsblkcnt_t = ::c_ulonglong;
+pub type fsfilcnt_t = ::c_ulonglong;
+pub type rlim_t = ::c_ulonglong;
 
 s! {
-    pub struct stat {
-        pub st_dev: ::dev_t,
-        pub st_ino: ::ino_t,
-        pub st_nlink: ::nlink_t,
-        pub st_mode: ::mode_t,
-        pub st_uid: ::uid_t,
-        pub st_gid: ::gid_t,
-        __pad0: ::c_int,
-        pub st_rdev: ::dev_t,
-        pub st_size: ::off_t,
-        pub st_blksize: ::blksize_t,
-        pub st_blocks: ::blkcnt_t,
-        pub st_atime: ::time_t,
-        pub st_atime_nsec: ::c_long,
-        pub st_mtime: ::time_t,
-        pub st_mtime_nsec: ::c_long,
-        pub st_ctime: ::time_t,
-        pub st_ctime_nsec: ::c_long,
-        __unused: [::c_long; 3],
-    }
-
-    pub struct stat64 {
-        pub st_dev: ::dev_t,
-        pub st_ino: ::ino64_t,
-        pub st_nlink: ::nlink_t,
-        pub st_mode: ::mode_t,
-        pub st_uid: ::uid_t,
-        pub st_gid: ::gid_t,
-        __pad0: ::c_int,
-        pub st_rdev: ::dev_t,
-        pub st_size: ::off_t,
-        pub st_blksize: ::blksize_t,
-        pub st_blocks: ::blkcnt64_t,
-        pub st_atime: ::time_t,
-        pub st_atime_nsec: ::c_long,
-        pub st_mtime: ::time_t,
-        pub st_mtime_nsec: ::c_long,
-        pub st_ctime: ::time_t,
-        pub st_ctime_nsec: ::c_long,
-        __reserved: [::c_long; 3],
-    }
-
-    pub struct pthread_attr_t {
-        __size: [u64; 7]
-    }
-
-    pub struct sigset_t {
-        __val: [::c_ulong; 16],
-    }
-
     pub struct sigaction {
         pub sa_sigaction: ::sighandler_t,
         pub sa_mask: ::sigset_t,
@@ -95,19 +45,6 @@
         __unused2: ::c_long
     }
 
-    pub struct shmid_ds {
-        pub shm_perm: ::ipc_perm,
-        pub shm_segsz: ::size_t,
-        pub shm_atime: ::time_t,
-        pub shm_dtime: ::time_t,
-        pub shm_ctime: ::time_t,
-        pub shm_cpid: ::pid_t,
-        pub shm_lpid: ::pid_t,
-        pub shm_nattch: ::c_ulong,
-        __pad1: ::c_ulong,
-        __pad2: ::c_ulong,
-    }
-
     pub struct statfs {
         pub f_type: ::c_ulong,
         pub f_bsize: ::c_ulong,
@@ -123,18 +60,6 @@
         pub f_spare: [::c_ulong; 4],
     }
 
-    pub struct msghdr {
-        pub msg_name: *mut ::c_void,
-        pub msg_namelen: ::socklen_t,
-        pub msg_iov: *mut ::iovec,
-        pub msg_iovlen: ::c_int,
-        __pad1: ::c_int,
-        pub msg_control: *mut ::c_void,
-        pub msg_controllen: ::socklen_t,
-        __pad2: ::socklen_t,
-        pub msg_flags: ::c_int,
-    }
-
     pub struct termios {
         pub c_iflag: ::tcflag_t,
         pub c_oflag: ::tcflag_t,
@@ -353,10 +278,6 @@
 pub const FALLOC_FL_KEEP_SIZE: ::c_int = 0x01;
 pub const FALLOC_FL_PUNCH_HOLE: ::c_int = 0x02;
 
-pub const _SC_2_C_VERSION: ::c_int = 96;
-
-pub const __SIZEOF_PTHREAD_RWLOCK_T: usize = 56;
-pub const __SIZEOF_PTHREAD_MUTEX_T: usize = 40;
 pub const __SIZEOF_PTHREAD_MUTEXATTR_T: usize = 4;
 
 pub const CPU_SETSIZE: ::c_int = 128;
@@ -407,7 +328,6 @@
 
 pub const EFD_NONBLOCK: ::c_int = 0x800;
 
-pub const F_GETLK: ::c_int = 5;
 pub const F_GETOWN: ::c_int = 9;
 pub const F_SETOWN: ::c_int = 8;
 
@@ -469,3 +389,15 @@
     pub fn eventfd(init: ::c_uint, flags: ::c_int) -> ::c_int;
     pub fn ptrace(request: ::c_int, ...) -> ::c_long;
 }
+
+cfg_if! {
+    if #[cfg(any(target_arch = "x86_64"))] {
+        mod b64;
+        pub use self::b64::*;
+    } else if #[cfg(any(target_arch = "x86",
+                        target_arch = "arm",
+                        target_arch = "asmjs"))] {
+        mod b32;
+        pub use self::b32::*;
+    } else { }
+}
diff --git a/src/unix/notbsd/linux/other/mod.rs b/src/unix/notbsd/linux/other/mod.rs
index 5ae7050..fbc5bd2 100644
--- a/src/unix/notbsd/linux/other/mod.rs
+++ b/src/unix/notbsd/linux/other/mod.rs
@@ -1,3 +1,7 @@
+pub type fsblkcnt_t = ::c_ulong;
+pub type fsfilcnt_t = ::c_ulong;
+pub type rlim_t = c_ulong;
+
 s! {
     pub struct sigaction {
         pub sa_sigaction: ::sighandler_t,
@@ -354,6 +358,8 @@
 pub const F_GETLK: ::c_int = 5;
 pub const F_GETOWN: ::c_int = 9;
 pub const F_SETOWN: ::c_int = 8;
+pub const F_SETLK: ::c_int = 6;
+pub const F_SETLKW: ::c_int = 7;
 
 pub const SFD_NONBLOCK: ::c_int = 0x0800;
 
diff --git a/src/unix/notbsd/mod.rs b/src/unix/notbsd/mod.rs
index 6c93a0d..ee123f0 100644
--- a/src/unix/notbsd/mod.rs
+++ b/src/unix/notbsd/mod.rs
@@ -1,6 +1,5 @@
 use dox::mem;
 
-pub type rlim_t = c_ulong;
 pub type sa_family_t = u16;
 pub type pthread_key_t = ::c_uint;
 pub type speed_t = ::c_uint;
@@ -108,7 +107,8 @@
         pub dli_saddr: *mut ::c_void,
     }
 
-    #[cfg_attr(any(target_arch = "x86", target_arch = "x86_64"),
+    #[cfg_attr(any(all(target_arch = "x86", not(target_env = "musl")),
+                   target_arch = "x86_64"),
                repr(packed))]
     pub struct epoll_event {
         pub events: ::uint32_t,
@@ -425,9 +425,6 @@
 
 pub const EFD_CLOEXEC: ::c_int = 0x80000;
 
-pub const F_SETLK: ::c_int = 6;
-pub const F_SETLKW: ::c_int = 7;
-
 pub const MNT_FORCE: ::c_int = 0x1;
 
 pub const Q_SYNC: ::c_int = 0x800001;