Index: guile-1.8.8/libguile/Makefile.am
===================================================================
--- guile-1.8.8.orig/libguile/Makefile.am
+++ guile-1.8.8/libguile/Makefile.am
@@ -265,7 +265,7 @@ libpath.h: $(srcdir)/Makefile.in  $(top_
 		>> libpath.tmp
 	@echo '	{ "LIBS",	   "@GUILE_LIBS@" }, \' >> libpath.tmp
 	@echo '	{ "CFLAGS",	   "@GUILE_CFLAGS@" }, \' >> libpath.tmp
-	@echo '	{ "buildstamp",    "'"`date`"'" }, \' >> libpath.tmp
+	@echo '	{ "buildstamp",    "'"`date -u -d \"@$${SOURCE_DATE_EPOCH:-$$(date +%s)}\" `"'" }, \' >> libpath.tmp
 	@echo '}' >> libpath.tmp
 	@mv libpath.tmp libpath.h