From ac7d75c4277a9915f48b7304ff05c3792f0a9650 Mon Sep 17 00:00:00 2001
From: Sandro Santilli <strk@kbt.io>
Date: Tue, 7 Feb 2017 21:42:32 +0000
Subject: [PATCH] Add check for pkg-config
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Patch by Björn Harrtell

References #3661

git-svn-id: http://svn.osgeo.org/postgis/trunk@15307 b70326c6-7e19-0410-871a-916f4a2858ee
---
 configure.ac | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/configure.ac b/configure.ac
index 3bcd97bbd..19204c97c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -897,6 +897,15 @@ AC_SUBST([HAVE_JSON])
 fi dnl }
 
 
+dnl ===========================================================================
+dnl Detect if pkg-config installed
+dnl ===========================================================================
+# check for pkg-config
+AC_PATH_PROG(PKG_CONFIG, pkg-config, no)
+if test "$PKG_CONFIG" = "no"; then
+   AC_MSG_WARN([Cannot find pkg-config, make sure it is installed in your PATH])
+fi
+
 
 dnl ===========================================================================
 dnl Detect if protobuf-c installed
@@ -940,8 +949,13 @@ LIBS="$PROTOBUF_LDFLAGS"
 AC_CHECK_LIB([protobuf-c], [protobuf_c_message_check], [HAVE_PROTOBUF=yes; PROTOBUF_LDFLAGS="${PROTOBUF_LDFLAGS} -lprotobuf-c"], [HAVE_PROTOBUF=no])
 LIBS="$LIBS_SAVE"
 
-dnl Ensure libprotobuf-c is of minimum required version
-PKG_CHECK_MODULES([PROTOBUFC], [libprotobuf-c >= 1.1.0], [HAVE_PROTOBUF=yes], [HAVE_PROTOBUF=no])
+if test "$PKG_CONFIG" = "no"; then
+	AC_MSG_WARN([Cannot find pkg-config, disabling protobuf support.])
+	HAVE_PROTOBUF=no
+else
+	dnl Ensure libprotobuf-c is of minimum required version
+	PKG_CHECK_MODULES([PROTOBUFC], [libprotobuf-c >= 1.1.0], [HAVE_PROTOBUF=yes], [HAVE_PROTOBUF=no])
+fi
 
 if test "$HAVE_PROTOBUF" = "yes"; then
 	AC_PATH_PROG(PROTOCC, protoc-c)
-- 
2.40.0