https://bugs.gentoo.org/775878

commit efbee1f631981bd454051d20796f1cd52fe16f00
Author: orbea <orbea@riseup.net>
Date:   Fri Mar 19 09:01:22 2021 -0700

    build: Fix the pgsql linker path.

diff --git a/acinclude.m4 b/acinclude.m4
index 8e89af8..7504d63 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -191,7 +191,7 @@ if test "$ac_pgsql" = "yes"; then
 		PGSQL_INCLUDE=-I$ac_pgsql_incdir
 	fi
 	if test "$ac_pgsql_libdir" = "no"; then
-		PGSQL_LDFLAGS=`pg_config --libdir`
+		PGSQL_LDFLAGS=-L`pg_config --libdir`
 	else
 		PGSQL_LDFLAGS=-L$ac_pgsql_libdir
 	fi