I wrote:
> I'd suggest reverting the change in how PG_VERSION_NUM is computed
> in configure.in --- that was certainly not necessary to the patch,
> and evidently you're falling foul of some weird behavior around
> nesting double-quotes and backquotes.
Actually, you can just get rid of the nesting, because there's no
need to be picky about what white-space gets fed to awk. The
attached seems to be enough to fix it (tested on gaur).
regards, tom lane
diff --git a/configure b/configure
index d6d3f26..1a0aca9 100755
--- a/configure
+++ b/configure
@@ -18887,7 +18887,7 @@ _ACEOF
# Supply a numeric version string for use by 3rd party add-ons
# awk -F is a regex on some platforms, and not on others, so make "." a tab
-PG_VERSION_NUM="`echo "$PG_MAJORVERSION $PG_MINORVERSION" |
+PG_VERSION_NUM="`echo $PG_MAJORVERSION $PG_MINORVERSION |
$AWK '{printf "%d%04d", $1, $2}'`"
cat >>confdefs.h <<_ACEOF
diff --git a/configure.in b/configure.in
index 78902fb..b27708e 100644
--- a/configure.in
+++ b/configure.in
@@ -2322,7 +2322,7 @@ AC_DEFINE_UNQUOTED(PG_VERSION_STR,
# Supply a numeric version string for use by 3rd party add-ons
# awk -F is a regex on some platforms, and not on others, so make "." a tab
-[PG_VERSION_NUM="`echo "$PG_MAJORVERSION $PG_MINORVERSION" |
+[PG_VERSION_NUM="`echo $PG_MAJORVERSION $PG_MINORVERSION |
$AWK '{printf "%d%04d", $1, $2}'`"]
AC_DEFINE_UNQUOTED(PG_VERSION_NUM, $PG_VERSION_NUM, [PostgreSQL version as a number])
AC_SUBST(PG_VERSION_NUM)