Index: sys/conf/newvers.sh
===================================================================
--- sys/conf/newvers.sh
+++ sys/conf/newvers.sh
@@ -271,6 +271,8 @@
 		modified=yes
 	fi
 	git=" ${git}"
+
+	timestamp=$($git_cmd show -s --format=%ct HEAD 2>/dev/null)
 fi
 
 if [ -n "$gituprevision" ] ; then
@@ -297,6 +299,13 @@
 	VERINFO="${VERSION} #${v}${svn}${git}${gitup}${hg}: ${t}"
 	VERSTR="${VERINFO}\\n    ${u}@${h}:${d}\\n"
 fi
+if [ -n "$timestamp" ]; then
+	TSTAMP="#define SOURCE_TIMESTAMP ${timestamp}
+"
+else
+	TSTAMP=
+
+fi
 
 vers_content_new=$(cat << EOF
 $COPYRIGHT
@@ -311,7 +320,7 @@
 #define SCCSSTR "@(#)${VERINFO}"
 #define VERSTR "${VERSTR}"
 #define RELSTR "${RELEASE}"
-
+${TSTAMP}
 const char sccs[sizeof(SCCSSTR) > 128 ? sizeof(SCCSSTR) : 128] = SCCSSTR;
 const char version[sizeof(VERSTR) > 256 ? sizeof(VERSTR) : 256] = VERSTR;
 const char compiler_version[] = "${compiler_v}";