diff --git a/winsup/cygwin/ChangeLog b/winsup/cygwin/ChangeLog
index 1b8bbb9ea..2a0bce12e 100644
--- a/winsup/cygwin/ChangeLog
+++ b/winsup/cygwin/ChangeLog
@@ -1,3 +1,8 @@
+2002-03-03  Robert Collins  <rbtcollins@hotmail.com>
+
+	* shm.cc (shmat): Prevent a compile error.
+	(shmdt): Set errno as this function is incomplete.
+
 2002-02-28  Christopher Faylor  <cgf@redhat.com>
 
 	* times.cc: Remove if 0'd code.  Clean up slightly.
diff --git a/winsup/cygwin/shm.cc b/winsup/cygwin/shm.cc
index dbe9bb0e9..7fe95edde 100644
--- a/winsup/cygwin/shm.cc
+++ b/winsup/cygwin/shm.cc
@@ -229,7 +229,7 @@ shmat (int shmid, const void *shmaddr, int shmflg)
 
     }
 
-  class shmid_ds *shm = tempnode->shmds;
+  // class shmid_ds *shm = tempnode->shmds;
 
   if (shmaddr)
     {
@@ -277,7 +277,8 @@ shmdt (const void *shmaddr)
   /* this should be "rare" so a hefty search is ok. If this is common, then we
    * should alter the data structs to allow more optimisation
    */
-  
+  set_errno (ENOTSUP);
+  return -1;
 }
 
 //FIXME: who is allowed to perform STAT?