gentoo-overlay/app-admin/syslog-ng/files/syslog-ng-3.30.1-esmtp-pkgconfig.patch

https://bugs.gentoo.org/782643
https://github.com/syslog-ng/syslog-ng/pull/3669/commits/b8284f8ecac588f6a321c779cce06cbe182611a5

From b8284f8ecac588f6a321c779cce06cbe182611a5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?L=C3=A1szl=C3=B3=20V=C3=A1rady?=
 <laszlo.varady@protonmail.com>
Date: Sun, 9 May 2021 03:43:46 +0200
Subject: [PATCH] configure: add pkg-config detection for libesmtp
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Signed-off-by: László Várady <laszlo.varady@protonmail.com>
---
 configure.ac | 22 +++++++++++++---------
 1 file changed, 13 insertions(+), 9 deletions(-)

diff --git a/configure.ac b/configure.ac
index 86b67ba9a2..bd6efa8711 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1278,15 +1278,19 @@ if test "x$enable_smtp" != "xno" && test "x$with_libesmtp" != "xno"; then
 		CPPFLAGS="$CPPFLAGS_SAVE"
 		LDFLAGS="$LDFLAGS_SAVE"
 	else
-		AC_MSG_CHECKING(for libESMTP)
-		if libesmtp-config --version >/dev/null 2>&1; then
-			AC_MSG_RESULT(yes)
-			LIBESMTP_CFLAGS="`libesmtp-config --cflags`"
-			LIBESMTP_LIBS="`libesmtp-config --libs`"
-		else
-			AC_MSG_RESULT(no)
-			libesmtp=no
-		fi
+		PKG_CHECK_MODULES(LIBESMTP, libesmtp-1.0, libesmtp="yes", libesmtp="no")
+		if test "x$libesmtp" = "xno"; then
+			AC_MSG_CHECKING(for libESMTP with libesmtp-config)
+			if libesmtp-config --version >/dev/null 2>&1; then
+				AC_MSG_RESULT(yes)
+				LIBESMTP_CFLAGS="`libesmtp-config --cflags`"
+				LIBESMTP_LIBS="`libesmtp-config --libs`"
+				libesmtp="yes"
+			else
+				AC_MSG_RESULT(no)
+				libesmtp=no
+			fi
+                fi
 	fi
 	if test "x$enable_smtp" = "xyes" && test "x$libesmtp" = "xno"; then
 		AC_MSG_ERROR(libESMTP not found)