[7.2.0beta3-fpm] libpng12-dev not available

[DaazKu]

Status: Downloaded newer image for php:7.2-rc-fpm
 ---> 008dcb3cc91c
Step 2/12 : RUN apt-get update \
    && apt-get install -y \
        libfreetype6-dev \
        libjpeg62-turbo-dev \
        libmemcached-dev \
        libpng12-dev \
        sendmail \
    && docker-php-ext-configure gd --with-freetype-dir=/usr/include/ --with-jpeg-dir=/usr/include/ \
    && docker-php-ext-install gd mbstring mcrypt pdo pdo_mysql \
    && pecl install xdebug \
    && docker-php-ext-enable xdebug
 ---> Running in 3ab392bcb4c8
Get:1 http://security.debian.org stretch/updates InRelease [62.9 kB]
Get:3 http://security.debian.org stretch/updates/main amd64 Packages [189 kB]
Ign:2 http://cdn-fastly.deb.debian.org/debian stretch InRelease
Get:4 http://cdn-fastly.deb.debian.org/debian stretch-updates InRelease [88.5 kB]
Get:5 http://cdn-fastly.deb.debian.org/debian stretch Release [118 kB]
Get:6 http://cdn-fastly.deb.debian.org/debian stretch Release.gpg [2373 B]
Get:7 http://cdn-fastly.deb.debian.org/debian stretch/main amd64 Packages [9497 kB]
Fetched 9958 kB in 4s (2019 kB/s)
Reading package lists...
Reading package lists...
Building dependency tree...
Reading state information...
Package libpng12-dev is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'libpng12-dev' has no installation candidate
ERROR: Service 'php_fpm' failed to build: The command '/bin/sh -c apt-get update     && apt-get install -y         libfreetype6-dev         libjpeg62-turbo-dev         libmcrypt-dev         libmemcached-dev         libpng12-dev         sendmail     && docker-php-ext-configure gd --with-freetype-dir=/usr/include/ --with-jpeg-dir=/usr/include/     && docker-php-ext-install gd mbstring mcrypt pdo pdo_mysql     && pecl install xdebug     && docker-php-ext-enable xdebug' returned a non-zero code: 100

[tianon]

I believe the package you really want is simply "libpng-dev" ( https://packages.debian.org/stretch/libpng-dev).

[DaazKu]

That's possible but it worked for 7.0 and 7.1 and the doc from https://hub.docker.com/_/php/ needs to be updated if that is the case:

[tianon]

Yes, they're based on different versions of Debian, so some of the package names have to shift accordingly.

[ehuggett]

libpng-dev appears to be a virtual package in debian jessie, which results in libpng12-dev being installed.

It seems the documentation can be changed to state libpng-dev as the dependency / package to install (and this will work for Jessie and Stretch)?

[tianon]

Yeah, if it works that'd be an excellent change!

[tianon]

See also #504, which is a discussion regarding the base images of each PHP version.

[tianon]

Verified that the swap to libpng-dev works and applied to the documentation in docker-library/docs@b48ce3c. Thanks for the suggestion, @ehuggett!