[PATCH] configure: fix reference to possibly undefined $PKG_CONFIG_PATH

[Daniel Kahn Gillmor]

On Sun 2019-11-17 23:24:41 +0200, Tomi Ollila wrote:
> 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 2160be37..00a9d03d 100755
> --- a/configure
> +++ b/configure
> @@ -606,7 +606,7 @@ 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

LGTM.  Thanks, Tomi.

       --dkg
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