From a5e7a7a73950cc881cd25e4775ad30726e415d3a Mon Sep 17 00:00:00 2001
From: Jeremy Sowden <jeremy@azazel.net>
Date: Sun, 9 Jan 2022 11:57:52 +0000
Subject: build: if `--enable-pgsql` is `yes`, abort if libpq is not found

If PostgreSQL support has been explicitly requested, abort if it is not
available.

Signed-off-by: Jeremy Sowden <jeremy@azazel.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 configure.ac | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/configure.ac b/configure.ac
index 41eeb52..62c43d6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -104,6 +104,12 @@ AS_IF([test "x$enable_pgsql" != "xno"], [
       AC_MSG_RESULT([no])
     ])
 
+    AS_IF([test "x$libpq_LIBS" = "x"], [
+      AS_IF([test "x$enable_pgsql" = "xyes"], [
+        AC_MSG_ERROR([libpq not found])
+      ])
+    ])
+
   ])
 
 ])
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