Oops. Forgot to check this in. Thanks Martin Volf for noticing

 -Erik

libc/unistd/Makefile

@@ -27,7 +27,7 @@ DIRS:=
 
 CSRC=execl.c execlp.c execv.c execvep.c execvp.c execle.c getcwd.c \
 	sleep.c usleep.c getpass.c sysconf_src.c getlogin.c \
-	fpathconf.c confstr.c pathconf.c swab.c
+	fpathconf.c confstr.c pathconf.c swab.c usershell.c
 ifeq ($(strip $(HAS_MMU)),true)
     CSRC+=daemon.c
 endif