docker build does not work

[JavierCVilla]

After replacing libpng12-dev by libpng-dev in the Dockerfile, I get the following error when I try to docker-build the image:

...

running: find "/tmp/pear/temp/pear-build-defaultuseref2WdN/install-xdebug-2.5.5" | xargs ls -dils
   18192    0 drwxr-xr-x. 3 root root      17 Oct  8 13:01 /tmp/pear/temp/pear-build-defaultuseref2WdN/install-xdebug-2.5.5
46375466    0 drwxr-xr-x. 3 root root      19 Oct  8 13:01 /tmp/pear/temp/pear-build-defaultuseref2WdN/install-xdebug-2.5.5/usr
50429481    0 drwxr-xr-x. 3 root root      17 Oct  8 13:01 /tmp/pear/temp/pear-build-defaultuseref2WdN/install-xdebug-2.5.5/usr/local
54607111    0 drwxr-xr-x. 3 root root      17 Oct  8 13:01 /tmp/pear/temp/pear-build-defaultuseref2WdN/install-xdebug-2.5.5/usr/local/lib
58842935    0 drwxr-xr-x. 3 root root      24 Oct  8 13:01 /tmp/pear/temp/pear-build-defaultuseref2WdN/install-xdebug-2.5.5/usr/local/lib/php
63365695    0 drwxr-xr-x. 3 root root      39 Oct  8 13:01 /tmp/pear/temp/pear-build-defaultuseref2WdN/install-xdebug-2.5.5/usr/local/lib/php/extensions
   18193    0 drwxr-xr-x. 2 root root      23 Oct  8 13:01 /tmp/pear/temp/pear-build-defaultuseref2WdN/install-xdebug-2.5.5/usr/local/lib/php/extensions/no-debug-non-zts-20151012
   18194 1400 -rwxr-xr-x. 1 root root 1431400 Oct  8 13:01 /tmp/pear/temp/pear-build-defaultuseref2WdN/install-xdebug-2.5.5/usr/local/lib/php/extensions/no-debug-non-zts-20151012/xdebug.so

Build process completed successfully
Installing '/usr/local/lib/php/extensions/no-debug-non-zts-20151012/xdebug.so'
install ok: channel://pecl.php.net/xdebug-2.5.5
configuration option "php_ini" is not set to php.ini location
You should add "zend_extension=/usr/local/lib/php/extensions/no-debug-non-zts-20151012/xdebug.so" to php.ini
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  269k  100  269k    0     0  1155k      0 --:--:-- --:--:-- --:--:-- 1156k
-: FAILED
sha384sum: WARNING: 1 computed checksum did NOT match
The command '/bin/sh -c curl -sL https://deb.nodesource.com/setup_6.x | bash                        && apt-get install -y git libbz2-dev libfreetype6-dev libjpeg62-turbo-dev         libmcrypt-dev libpng-dev libpq-dev libxslt-dev libxss1 nodejs unzip wget     zip                                                                         && docker-php-ext-configure pgsql --with-pgsql=/usr/local/pgsql                && docker-php-ext-configure gd --with-freetype-dir=/usr/include/                                              --with-jpeg-dir=/usr/include/                   && docker-php-ext-install -j$(nproc) bcmath bz2 gd pdo_mysql pdo_pgsql xsl     && pecl install xdebug-2.5.5                                                   && docker-php-ext-enable xdebug                                                && (                                                                                echo '544e09ee 996cdf60 ece3804a bc52599c'                                   ; echo '22b1f40f 4323403c 44d44fdf dd586475'                                   ; echo 'ca9813a8 58088ffb c1f233e9 b180f061'                                   ) | tr -d "\\n " | sed 's/$/  -/g' > checksum                               && curl -o - 'https://getcomposer.org/installer'                               |  tee composer-setup.php                                                      |  sha384sum -c checksum                                                       && rm checksum                                                                 || ( rm -f checksum composer-setup.php && false )                              && php composer-setup.php --install-dir=/usr/local/bin --filename=composer     && php -r "unlink('composer-setup.php');"                                      && composer self-update --no-interaction' returned a non-zero code: 1

Looks like it is related to this step in the Dockerfile.