--- a/Make.proto	Sun Jan 19 16:29:54 2020 +0100
+++ b/Make.proto	Wed Jan 22 16:23:55 2020 +0100
@@ -122,7 +122,7 @@
 #
 # default target: create the TARGET (usually smalltalk)
 #
-all::   $(TARGET)$(TARGET_RULE_EXTENSION) symlinks
+all::   clearBuildDate $(TARGET)$(TARGET_RULE_EXTENSION) symlinks
 	@-if [ "$(ALSO_MAKE_STATIC_TARGET)" = "1" ]; then \
 	    mv stx stx_dynamic; \
 	    $(MAKE) stx_fullstatic; \
@@ -131,7 +131,7 @@
 #
 # same, force recreation of link-directories
 #
-allNew: $(TARGET)$(TARGET_RULE_EXTENSION) misc
+allNew: clearBuildDate $(TARGET)$(TARGET_RULE_EXTENSION) misc
 	@-if [ "$(ALSO_MAKE_STATIC_TARGET)" = "1" ]; then \
 	    mv stx stx_dynamic; \
 	    $(MAKE) stx_fullstatic; \
@@ -143,6 +143,9 @@
 #
 symlinks:   includeLink misc
 
+clearBuildDate:
+	-del buildDate.h
+
 #
 # the standard smalltalk executable:
 # basic classes + view & widgets + tools + persistency