From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andreas Enge <andreas@enge.fr>
Subject: Re: missing input and more
Date: Thu, 5 Feb 2015 16:59:24 +0100
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On Thu, Feb 05, 2015 at 07:01:18PM +0800, 宋文武 wrote:
> Ah, I think libraries in 'Requires.private' should also be propagated,
> otherwise, we got:
>   $ pkg-config --cflags gnutls
>   = Package 'zlib', required by 'GnuTLS', not found
> If not propagated, other packages use gnutls have to add zlib to inputs,
> even they never use it.

For whatever reason, this command works for me:
$ pkg-config --cflags gnutls
-I/gnu/store/0mfgwxgqyhlvi5xyi1j2lbr3ygczsdyp-gnutls-3.2.21/include -I/gnu/store/gayyfjxgsbpym1dcnd3b9mzwj2fz3jvj-nettle-2.7.1/include -I/gnu/store/dm9cnj2ng8a58l88j4bs9zjf78ysjprv-libtasn1-4.2/include

with the one that was currently in my profile, and
$ pkg-config --cflags gnutls
-I/gnu/store/msknn44rcfwfall90lz1kcklsd34iy21-gnutls-3.3.12/include -I/gnu/store/gayyfjxgsbpym1dcnd3b9mzwj2fz3jvj-nettle-2.7.1/include -I/gnu/store/dm9cnj2ng8a58l88j4bs9zjf78ysjprv-libtasn1-4.2/include

with the latest version.

Andreas