diff --git a/configure b/configure
index 0407c4f8bfc..3cf209613a7 100755
--- a/configure
+++ b/configure
@@ -627,6 +627,7 @@ ac_includes_default="\
 
 ac_subst_vars='LTLIBOBJS
 vpath_build
+PG_VERSION_NUM
 PROVE
 OSX
 XSLTPROC
@@ -15521,6 +15522,7 @@ _ACEOF
 
 
 
+
 # Begin output steps
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: using compiler=$cc_string" >&5
diff --git a/configure.in b/configure.in
index 1de41a22ede..8f8ed69f86d 100644
--- a/configure.in
+++ b/configure.in
@@ -2136,6 +2136,7 @@ AC_DEFINE_UNQUOTED(PG_VERSION_STR,
 tr '.' '	' |
 $AWK '{printf "%d%02d%02d", $1, $2, (NF >= 3) ? $3 : 0}'`"]
 AC_DEFINE_UNQUOTED(PG_VERSION_NUM, $PG_VERSION_NUM, [PostgreSQL version as a number])
+AC_SUBST(PG_VERSION_NUM)
 
 
 # Begin output steps
diff --git a/src/Makefile.global.in b/src/Makefile.global.in
index c583b44dbf3..8eab178ebd3 100644
--- a/src/Makefile.global.in
+++ b/src/Makefile.global.in
@@ -38,6 +38,7 @@ all:
 # PostgreSQL version number
 VERSION = @PACKAGE_VERSION@
 MAJORVERSION = @PG_MAJORVERSION@
+VERSION_NUM = @PG_VERSION_NUM@
 
 # Support for VPATH builds
 # (PGXS VPATH support is handled separately in pgxs.mk)