Index: libcfa/prelude/Makefile.am
===================================================================
--- libcfa/prelude/Makefile.am	(revision 33a484f8bdc56ff34048392886d700d068f236ee)
+++ libcfa/prelude/Makefile.am	(revision fb64e86bb9e4500074425f9fa73c2667ad6f120f)
@@ -11,6 +11,6 @@
 ## Created On       : Sun May 31 08:54:01 2015
 ## Last Modified By : Peter A. Buhr
-## Last Modified On : Wed Dec 14 15:00:35 2016
-## Update Count     : 205
+## Last Modified On : Mon Feb  3 21:27:18 2020
+## Update Count     : 208
 ###############################################################################
 
@@ -36,4 +36,5 @@
 extras.cf : ${srcdir}/extras.regx ${srcdir}/extras.c
 	${AM_V_GEN}gcc ${AM_CFLAGS} -E ${srcdir}/extras.c | grep -f ${srcdir}/extras.regx > extras.cf
+	${AM_V_GEN}gcc ${AM_CFLAGS} -E ${srcdir}/extras.c | grep -zo -f ${srcdir}/extras.regx2 | tr '\0' '\n' >> extras.cf
 
 # create forward declarations for gcc builtins
Index: libcfa/prelude/Makefile.in
===================================================================
--- libcfa/prelude/Makefile.in	(revision 33a484f8bdc56ff34048392886d700d068f236ee)
+++ libcfa/prelude/Makefile.in	(revision fb64e86bb9e4500074425f9fa73c2667ad6f120f)
@@ -1,6 +1,6 @@
-# Makefile.in generated by automake 1.15 from Makefile.am.
+# Makefile.in generated by automake 1.16.1 from Makefile.am.
 # @configure_input@
 
-# Copyright (C) 1994-2014 Free Software Foundation, Inc.
+# Copyright (C) 1994-2018 Free Software Foundation, Inc.
 
 # This Makefile.in is free software; the Free Software Foundation
@@ -331,6 +331,6 @@
 	    cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh;; \
 	  *) \
-	    echo ' cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__depfiles_maybe)'; \
-	    cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__depfiles_maybe);; \
+	    echo ' cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles)'; \
+	    cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles);; \
 	esac;
 
@@ -377,5 +377,8 @@
 
 
-distdir: $(DISTFILES)
+distdir: $(BUILT_SOURCES)
+	$(MAKE) $(AM_MAKEFLAGS) distdir-am
+
+distdir-am: $(DISTFILES)
 	@srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
 	topsrcdirstrip=`echo "$(top_srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
@@ -540,4 +543,5 @@
 extras.cf : ${srcdir}/extras.regx ${srcdir}/extras.c
 	${AM_V_GEN}gcc ${AM_CFLAGS} -E ${srcdir}/extras.c | grep -f ${srcdir}/extras.regx > extras.cf
+	${AM_V_GEN}gcc ${AM_CFLAGS} -E ${srcdir}/extras.c | grep -zo -f ${srcdir}/extras.regx2 | tr '\0' '\n' >> extras.cf
 
 # create forward declarations for gcc builtins
Index: libcfa/prelude/extras.regx
===================================================================
--- libcfa/prelude/extras.regx	(revision 33a484f8bdc56ff34048392886d700d068f236ee)
+++ libcfa/prelude/extras.regx	(revision fb64e86bb9e4500074425f9fa73c2667ad6f120f)
@@ -24,8 +24,2 @@
 typedef.* char32_t;
 typedef.* wchar_t;
-extern.*\*malloc\(.*\).*
-extern.* free\(.*\).*
-extern.* exit\(.*\).*
-extern.* atexit\(.*\).*
-extern.* abort\(.*\).*
-extern.* printf\(.*\).*
Index: libcfa/prelude/extras.regx2
===================================================================
--- libcfa/prelude/extras.regx2	(revision fb64e86bb9e4500074425f9fa73c2667ad6f120f)
+++ libcfa/prelude/extras.regx2	(revision fb64e86bb9e4500074425f9fa73c2667ad6f120f)
@@ -0,0 +1,6 @@
+extern void \*malloc[^;]*;
+extern void free[^;]*;
+extern void exit[^;]*;
+extern int atexit[^;]*;
+extern void abort[^;]*;
+extern int printf[^;]*;