diff --git a/configure.ac b/configure.ac
index 277bad5..0d6e6ef 100755
--- a/configure.ac
+++ b/configure.ac
@@ -189,6 +189,9 @@
 dnl ----------------------
 dnl Packages configuration
 dnl ----------------------
+AC_ARG_WITH(pkg-extra-version,
+	AS_HELP_STRING([--with-pkg-extra-version=VER], [add extra version field, for packagers/distributions]),
+	[EXTRAVERSION=$withval],)
 AC_ARG_ENABLE(vtysh,
 [  --enable-vtysh          include integrated vty shell for Quagga])
 AC_ARG_ENABLE(ipv6,
@@ -382,6 +385,16 @@
 
 AC_SUBST(MULTIPATH_NUM)
 
+dnl -----------------------------------
+dnl Add extra version string to package
+dnl name, string and version fields.
+dnl -----------------------------------
+if test "x${EXTRAVERSION}" != "x" ; then
+  VERSION=${VERSION}${EXTRAVERSION}
+  PACKAGE_VERSION=${PACKAGE_VERSION}${EXTRAVERSION}
+  PACKAGE_STRING=${PACKAGE_STRING}${EXTRAVERSION}
+fi
+
 dnl ------------------------------------
 dnl Check C keywords and standard  types
 dnl ------------------------------------
@@ -1636,7 +1649,7 @@
 Quagga configuration
 --------------------
 quagga version          : ${PACKAGE_VERSION}
-host operating system  : ${host_os}
+host operating system   : ${host_os}
 source code location    : ${srcdir}
 compiler                : ${CC}
 compiler flags          : ${CFLAGS}