diff --git a/basis/io/backend/unix/multiplexers/kqueue/kqueue.factor b/basis/io/backend/unix/multiplexers/kqueue/kqueue.factor
index f7b15beb54..e01f33bbd8 100644
--- a/basis/io/backend/unix/multiplexers/kqueue/kqueue.factor
+++ b/basis/io/backend/unix/multiplexers/kqueue/kqueue.factor
@@ -2,28 +2,28 @@
 ! See http://factorcode.org/license.txt for BSD license.
 USING: accessors alien.c-types combinators destructors
 io.backend.unix kernel math.bitwise sequences struct-arrays unix
-unix.kqueue unix.time assocs io.backend.unix.multiplexers ;
+unix.kqueue unix.time assocs io.backend.unix.multiplexers
+classes.struct ;
 IN: io.backend.unix.multiplexers.kqueue
 
 TUPLE: kqueue-mx < mx events ;
 
-: max-events ( -- n )
-    #! We read up to 256 events at a time. This is an arbitrary
-    #! constant...
-    256 ; inline
+! We read up to 256 events at a time. This is an arbitrary
+! constant...
+CONSTANT: max-events 256
 
 : <kqueue-mx> ( -- mx )
     kqueue-mx new-mx
         kqueue dup io-error >>fd
-        max-events "kevent" <struct-array> >>events ;
+        max-events \ kevent <struct-array> >>events ;
 
 M: kqueue-mx dispose* fd>> close-file ;
 
 : make-kevent ( fd filter flags -- event )
-    "kevent" <c-object>
-    [ set-kevent-flags ] keep
-    [ set-kevent-filter ] keep
-    [ set-kevent-ident ] keep ;
+    \ kevent <struct>
+        swap >>flags
+        swap >>filter
+        swap >>ident ;
 
 : register-kevent ( kevent mx -- )
     fd>> swap 1 f 0 f kevent io-error ;
@@ -63,13 +63,14 @@ M: kqueue-mx remove-output-callbacks ( fd mx -- seq )
     ] dip kevent multiplexer-error ;
 
 : handle-kevent ( mx kevent -- )
-    [ kevent-ident swap ] [ kevent-filter ] bi {
+    [ ident>> swap ] [ filter>> ] bi {
         { EVFILT_READ [ input-available ] }
         { EVFILT_WRITE [ output-available ] }
     } case ;
 
 : handle-kevents ( mx n -- )
-    [ dup events>> ] dip head-slice [ handle-kevent ] with each ;
+    [ dup events>> ] dip head-slice
+    [ \ kevent memory>struct handle-kevent ] with each ;
 
 M: kqueue-mx wait-for-events ( us mx -- )
     swap dup [ make-timespec ] when
diff --git a/basis/io/files/info/unix/openbsd/openbsd.factor b/basis/io/files/info/unix/openbsd/openbsd.factor
index 7f23324fec..6c334b8d62 100644
--- a/basis/io/files/info/unix/openbsd/openbsd.factor
+++ b/basis/io/files/info/unix/openbsd/openbsd.factor
@@ -47,6 +47,6 @@ M: openbsd statvfs>file-system-info ( file-system-info statvfs -- file-system-in
 
 M: openbsd file-systems ( -- seq )
     f 0 0 getfsstat dup io-error
-    statfs <c-type-array> dup dup length 0 getfsstat io-error 
-    statfs heap-size group 
+    \ statfs <c-type-array> dup dup length 0 getfsstat io-error 
+    \ statfs heap-size group 
     [ f_mntonname>> alien>native-string file-system-info ] map ;
diff --git a/basis/unix/kqueue/freebsd/freebsd.factor b/basis/unix/kqueue/freebsd/freebsd.factor
index 1153b997c2..4bf5af8482 100644
--- a/basis/unix/kqueue/freebsd/freebsd.factor
+++ b/basis/unix/kqueue/freebsd/freebsd.factor
@@ -1,14 +1,13 @@
-USING: alien.syntax ;
+USING: alien.syntax classes.struct ;
 IN: unix.kqueue
 
-C-STRUCT: kevent
-    { "ulong"  "ident"  } ! identifier for this event
-    { "short"  "filter" } ! filter for event
-    { "ushort" "flags"  } ! action flags for kqueue
-    { "uint"   "fflags" } ! filter flag value
-    { "long"   "data"   } ! filter data value
-    { "void*"  "udata"  } ! opaque user data identifier
-;
+STRUCT: kevent
+    { ident  ulong }
+    { filter short }
+    { flags  ushort }
+    { fflags uint }
+    { data   long }
+    { udata  void* } ;
 
 FUNCTION: int kevent ( int kq, kevent* changelist, int nchanges, kevent* eventlist, int nevents, timespec* timeout ) ;
 
diff --git a/basis/unix/kqueue/macosx/macosx.factor b/basis/unix/kqueue/macosx/macosx.factor
index 843a0afad9..c30584efab 100644
--- a/basis/unix/kqueue/macosx/macosx.factor
+++ b/basis/unix/kqueue/macosx/macosx.factor
@@ -1,14 +1,13 @@
-USING: alien.syntax ;
+USING: alien.syntax classes.struct ;
 IN: unix.kqueue
 
-C-STRUCT: kevent
-    { "ulong"  "ident"  } ! identifier for this event
-    { "short"  "filter" } ! filter for event
-    { "ushort" "flags"  } ! action flags for kqueue
-    { "uint"   "fflags" } ! filter flag value
-    { "long"   "data"   } ! filter data value
-    { "void*"  "udata"  } ! opaque user data identifier
-;
+STRUCT: kevent
+    { ident  ulong }
+    { filter short }
+    { flags  ushort }
+    { fflags uint }
+    { data   long }
+    { udata  void* } ;
 
 FUNCTION: int kevent ( int kq, kevent* changelist, int nchanges, kevent* eventlist, int nevents, timespec* timeout ) ;
 
diff --git a/basis/unix/kqueue/netbsd/netbsd.factor b/basis/unix/kqueue/netbsd/netbsd.factor
index 7ba942d712..d9a9116930 100644
--- a/basis/unix/kqueue/netbsd/netbsd.factor
+++ b/basis/unix/kqueue/netbsd/netbsd.factor
@@ -1,14 +1,13 @@
-USING: alien.syntax ;
+USING: alien.syntax classes.struct ;
 IN: unix.kqueue
 
-C-STRUCT: kevent
-    { "ulong"    "ident"  } ! identifier for this event
-    { "uint"     "filter" } ! filter for event
-    { "uint"     "flags"  } ! action flags for kqueue
-    { "uint"     "fflags" } ! filter flag value
-    { "longlong" "data"   } ! filter data value
-    { "void*"    "udata"  } ! opaque user data identifier
-;
+STRUCT: kevent
+    { ident  ulong }
+    { filter uint }
+    { flags  uint }
+    { fflags uint }
+    { data   longlong }
+    { udata  void* } ;
 
 FUNCTION: int kevent ( int kq, kevent* changelist, size_t nchanges, kevent* eventlist, size_t nevents, timespec* timeout ) ;
 
diff --git a/basis/unix/kqueue/openbsd/openbsd.factor b/basis/unix/kqueue/openbsd/openbsd.factor
index c62ba05a4c..1d851c8d68 100644
--- a/basis/unix/kqueue/openbsd/openbsd.factor
+++ b/basis/unix/kqueue/openbsd/openbsd.factor
@@ -1,14 +1,13 @@
-USING: alien.syntax ;
+USING: alien.syntax classes.struct ;
 IN: unix.kqueue
 
-C-STRUCT: kevent
-    { "uint"   "ident"  } ! identifier for this event
-    { "short"  "filter" } ! filter for event
-    { "ushort" "flags"  } ! action flags for kqueue
-    { "uint"   "fflags" } ! filter flag value
-    { "int"    "data"   } ! filter data value
-    { "void*"  "udata"  } ! opaque user data identifier
-;
+STRUCT: kevent
+    { ident  uint }
+    { filter short }
+    { flags  ushort }
+    { fflags uint }
+    { data   int }
+    { udata  void* } ;
 
 FUNCTION: int kevent ( int kq, kevent* changelist, int nchanges, kevent* eventlist, int nevents, timespec* timeout ) ;
 
diff --git a/basis/unix/stat/freebsd/freebsd.factor b/basis/unix/stat/freebsd/freebsd.factor
index aeec5ef7a3..0acf2512e8 100644
--- a/basis/unix/stat/freebsd/freebsd.factor
+++ b/basis/unix/stat/freebsd/freebsd.factor
@@ -18,10 +18,10 @@ STRUCT: stat
     { st_blocks blkcnt_t }
     { st_blksize blksize_t }
     { st_flags fflags_t }
-    { st_gen _uint32_t }
+    { st_gen __uint32_t }
     { st_lspare __int32_t }
     { st_birthtimespec timespec }
-    { pad0 __int32_t[2] }
+    { pad0 __int32_t[2] } ;
 
 FUNCTION: int stat  ( char* pathname, stat* buf ) ;
 FUNCTION: int lstat ( char* pathname, stat* buf ) ;