Don't install tmp-difftime.h.

src/libraries/libansi/Makefile.src

 #
-# $Id: Makefile.src,v 1.4 1994/03/03 00:37:01 ceder Exp $
+# $Id: Makefile.src,v 1.5 1994/04/04 13:49:01 ceder Exp $
 # Copyright (C) 1991  Lysator Academic Computer Association.
 #
 # This file is part of the LysKOM server.
@@ -23,7 +23,6 @@
 # Please mail bug reports to bug-lyskom@lysator.liu.se. 
 #
 LK_STD
-LK_INSTALL_HDRS(tmp-difftime.h)
 LK_STD_LIB([libansi$(PROFILE-LIB-SUFFIX).a],[@LIBOBJS@ empty.o])
 LK_ALL_C_DEPEND
 LK_DESCEND