Bug#821122: [libgtk-3-dev] Missing dependencies accordingly to pkg-config

[Alexandre Pereira Nunes]

Package: libgtk-3-dev
Version: 3.18.9-1
Severity: grave

$ pkg-config gtk+-3.0 --cflags

Package libpng16 was not found in the pkg-config search path.
Perhaps you should add the directory containing `libpng16.pc'
to the PKG_CONFIG_PATH environment variable
Package 'libpng16', required by 'gdk-pixbuf-2.0', not found



-- System Information:
Debian Release: stretch/sid
  APT prefers testing
  APT policy: (990, 'testing'), (500, 'unstable'), (500, 'stable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.4.6 (SMP w/4 CPU cores; PREEMPT)
Locale: LANG=pt_BR.UTF-8, LC_CTYPE=pt_BR.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash
Init: systemd (via /run/systemd/system)

Versions of packages libgtk-3-dev depends on:
ii  dconf-gsettings-backend [gsettings-backend]  0.26.0-1
ii  gir1.2-gtk-3.0                               3.18.9-1
ii  libatk-bridge2.0-dev                         2.18.1-3
ii  libatk1.0-dev                                2.20.0-1
ii  libcairo2-dev                                1.14.6-1+b1
ii  libegl1-mesa-dev                             11.1.2-1
ii  libepoxy-dev                                 1.3.1-1
ii  libgdk-pixbuf2.0-dev                         2.32.3-2
ii  libglib2.0-dev                               2.48.0-1
ii  libgtk-3-0                                   3.18.9-1
ii  libgtk-3-common                              3.18.9-1
ii  libpango1.0-dev                              1.38.1-1
ii  libwayland-dev                               1.10.0-1
ii  libx11-dev                                   2:1.6.3-1
ii  libxcomposite-dev                            1:0.4.4-1
ii  libxcursor-dev                               1:1.1.14-1+b1
ii  libxdamage-dev                               1:1.1.4-2+b1
ii  libxext-dev                                  2:1.3.3-1
ii  libxfixes-dev                                1:5.0.1-2+b2
ii  libxi-dev                                    2:1.7.6-1
ii  libxinerama-dev                              2:1.1.3-1+b1
ii  libxkbcommon-dev                             0.5.0-1
ii  libxrandr-dev                                2:1.5.0-1
ii  pkg-config                                   0.29-3

libgtk-3-dev recommends no packages.

Versions of packages libgtk-3-dev suggests:
ii  libgtk-3-doc  3.18.9-1

-- no debconf information