diff --git a/include/download.mk b/include/download.mk
index 74e2c317d6..227612d9b8 100644
--- a/include/download.mk
+++ b/include/download.mk
@@ -33,9 +33,9 @@ $(strip \
 endef
 
 # code for creating tarballs from cvs/svn/git/bzr/hg/darcs checkouts - useful for mirror support
-dl_pack/bz2=$(TAR) cjf $(1) $(2)
-dl_pack/gz=$(TAR) czf $(1) $(2)
-dl_pack/xz=$(TAR) c $(2) | xz -zc > $(1)
+dl_pack/bz2=$(TAR) --owner=0 --group=0 --sort=name $$$${TAR_TIMESTAMP:+--mtime="$$$$TAR_TIMESTAMP"} -cjf $(1) $(2)
+dl_pack/gz=$(TAR) --owner=0 --group=0 --sort=name $$$${TAR_TIMESTAMP:+--mtime="$$$$TAR_TIMESTAMP"} -c $(2) | gzip -nc > $(1)
+dl_pack/xz=$(TAR) --owner=0 --group=0 --sort=name $$$${TAR_TIMESTAMP:+--mtime="$$$$TAR_TIMESTAMP"} -c $(2) | xz -zc > $(1)
 dl_pack/unknown=echo "ERROR: Unknown pack format for file $(1)"; false
 define dl_pack
 	$(if $(dl_pack/$(call ext,$(1))),$(dl_pack/$(call ext,$(1))),$(dl_pack/unknown))
@@ -79,6 +79,7 @@ define DownloadMethod/svn
 		svn export --non-interactive --trust-server-cert -r$(VERSION) $(URL) $(SUBDIR) || \
 		svn export --non-interactive -r$(VERSION) $(URL) $(SUBDIR) ) && \
 		echo "Packing checkout..." && \
+		export TAR_TIMESTAMP="" && \
 		$(call dl_pack,$(TMP_DIR)/dl/$(FILE),$(SUBDIR)) && \
 		mv $(TMP_DIR)/dl/$(FILE) $(DL_DIR)/ && \
 		rm -rf $(SUBDIR); \
@@ -96,6 +97,7 @@ define DownloadMethod/git
 		(cd $(SUBDIR) && git checkout $(VERSION) && \
 		git submodule update --init --recursive) && \
 		echo "Packing checkout..." && \
+		export TAR_TIMESTAMP=`cd $(SUBDIR) && git log -1 --format='@%ct'` && \
 		rm -rf $(SUBDIR)/.git && \
 		$(call dl_pack,$(TMP_DIR)/dl/$(FILE),$(SUBDIR)) && \
 		mv $(TMP_DIR)/dl/$(FILE) $(DL_DIR)/ && \
@@ -110,8 +112,9 @@ define DownloadMethod/bzr
 		cd $(TMP_DIR)/dl && \
 		rm -rf $(SUBDIR) && \
 		[ \! -d $(SUBDIR) ] && \
-		bzr export -r$(VERSION) $(SUBDIR) $(URL) && \
+		bzr export --per-file-timestamps -r$(VERSION) $(SUBDIR) $(URL) && \
 		echo "Packing checkout..." && \
+		export TAR_TIMESTAMP="" && \
 		$(call dl_pack,$(TMP_DIR)/dl/$(FILE),$(SUBDIR)) && \
 		mv $(TMP_DIR)/dl/$(FILE) $(DL_DIR)/ && \
 		rm -rf $(SUBDIR); \
@@ -126,6 +129,7 @@ define DownloadMethod/hg
 		rm -rf $(SUBDIR) && \
 		[ \! -d $(SUBDIR) ] && \
 		hg clone -r $(VERSION) $(URL) $(SUBDIR) && \
+		export TAR_TIMESTAMP=`cd $(SUBDIR) && hg log --template '@{date}' -l 1` && \
 		find $(SUBDIR) -name .hg | xargs rm -rf && \
 		echo "Packing checkout..." && \
 		$(call dl_pack,$(TMP_DIR)/dl/$(FILE),$(SUBDIR)) && \
@@ -142,6 +146,7 @@ define DownloadMethod/darcs
 		rm -rf $(SUBDIR) && \
 		[ \! -d $(SUBDIR) ] && \
 		darcs get -t $(VERSION) $(URL) $(SUBDIR) && \
+		export TAR_TIMESTAMP=`cd $(SUBDIR) && LC_ALL=C darcs log --last 1 | sed -ne 's!^Date: \+!!p'` && \
 		find $(SUBDIR) -name _darcs | xargs rm -rf && \
 		echo "Packing checkout..." && \
 		$(call dl_pack,$(TMP_DIR)/dl/$(FILE),$(SUBDIR)) && \