From b40c456d51bbd5cb4c15ffd1694a9a7266fe5bcf Mon Sep 17 00:00:00 2001
From: fidomax <adobegitler@gmail.com>
Date: Tue, 26 Jan 2021 08:48:17 +0300
Subject: [PATCH] Use pkg-config to get PROJ version if available

In case of cross-compile AC_PROJ_VERSION([POSTGIS_PROJ_VERSION]) fails.
So try to get version by pkg-config first
---
 configure.ac | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 9ac7051bb67..304476bdbfc 100644
--- a/configure.ac
+++ b/configure.ac
@@ -886,7 +886,13 @@ AC_CHECK_HEADER([proj_api.h],
 	)
 
 dnl Return the PROJ.4 version number
-AC_PROJ_VERSION([POSTGIS_PROJ_VERSION])
+if test ! -z "$PKG_CONFIG"; then
+	PKG_CHECK_MODULES([PROJ], [proj], [
+		POSTGIS_PROJ_VERSION=`$PKG_CONFIG proj --modversion | sed 's/\([[0-9]]\).*\([[0-9]]\).*\([[0-9]]\)/\1\2/'`
+	], [])
+else
+	AC_PROJ_VERSION([POSTGIS_PROJ_VERSION])
+fi
 AC_DEFINE_UNQUOTED([POSTGIS_PROJ_VERSION], [$POSTGIS_PROJ_VERSION], [PROJ library version])
 AC_SUBST([POSTGIS_PROJ_VERSION])
 CPPFLAGS="$CPPFLAGS_SAVE"