From eb1f799892a483f4e933867b2b9bafabd405045e Mon Sep 17 00:00:00 2001
From: Tomi Ollila <tomi.ollila@iki.fi>
Date: Sun, 17 Nov 2019 23:24:41 +0200
Subject: [PATCH] configure: fix reference to possibly undefined
 $PKG_CONFIG_PATH

In case zlib not found by pkg-config(1) the pkg-config information
is resolved by attempting to print ZLIB_VERSION from from zlib
installation if it exists anyway.

If above done successfully compat/zlib.pc is written for forthcoming
pkg-config execution.

Since `set -u` is in effect (since 124a67e96, 2016-05-06),
expanding unset $PKG_CONFIG_PATH (would have) failed whenever tried.

Now it is changed to set as "$PKG_CONFIG_PATH:compat" if PKG_CONFIG_PATH
is set and is non-empty string, plain "compat" otherwise.
---
 configure | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/configure b/configure
index fad2655c..c16d18dc 100755
--- a/configure
+++ b/configure
@@ -604,7 +604,7 @@ fi
 if ! pkg-config --exists zlib; then
   ${CC} -o compat/gen_zlib_pc "$srcdir"/compat/gen_zlib_pc.c >/dev/null 2>&1 &&
   compat/gen_zlib_pc > compat/zlib.pc &&
-  PKG_CONFIG_PATH="$PKG_CONFIG_PATH":compat &&
+  PKG_CONFIG_PATH=${PKG_CONFIG_PATH:+$PKG_CONFIG_PATH:}compat &&
   export PKG_CONFIG_PATH
   rm -f compat/gen_zlib_pc
 fi