Index: libcfa/Makefile.in
===================================================================
--- libcfa/Makefile.in	(revision 5887db27d78db5ba26c1f4044924c618b6c7c574)
+++ libcfa/Makefile.in	(revision 2bae7307ef1dfd61bebd71af26300f237aa9d35f)
@@ -11,6 +11,6 @@
 ## Created On       : Sat May 16 08:05:18 2015
 ## Last Modified By : Peter A. Buhr
-## Last Modified On : Mon May 25 09:33:47 2015
-## Update Count     : 4
+## Last Modified On : Mon May 25 15:15:00 2015
+## Update Count     : 5
 ###############################################################################
 
@@ -30,9 +30,15 @@
 # make forward declarations for gcc builtins
 builtins.cf : builtins.c
-	@BACKEND_CC@ -E -P $^ | sed -e "/targetm/s/.*//" -e "/_Decimal/s/.*//" -e "s/void (const char \*)0();//" -e "s/\"//g" -e "s/\(__builtin_\) /\1/" > $@
+	if [ -e builtins.c ] ; then \
+		@BACKEND_CC@ -E -P $^ | sed -e "/targetm/s/.*//" -e "/_Decimal/s/.*//" -e "s/void (const char \*)0();//" -e "s/\"//g" -e "s/\(__builtin_\) /\1/" > $@ ; \
+	fi
 	${INSTALL} builtins.cf @CFA_LIBDIR@
 
 builtins.c : builtins.def
-	@BACKEND_CC@ -E prototypes.c | awk -f prototypes.awk > $@
+	if [ -e builtins.def ] ; then \
+		@BACKEND_CC@ -E prototypes.c | awk -f prototypes.awk > $@ ; \
+	fi
+
+builtins.def :
 
 libcfa-prelude.c : @CFA_LIBDIR@/cfa-cpp prelude.cf builtins.cf