E: Package 'libpng12-dev' has no installation candidate

[alexsabau86]

Trying to install this from a Dockerfile - I've already tried using libpng-dev which in turn is giving the following error: Unable to load dynamic library '/usr/local/lib/php/extensions/no-debug-non-zts-20160303/gd.so' - libpng16.so.16: cannot open shared object file: No such file or directory in Unknown on line 0

I'm installing gd as well, so not sure what is going on.

Docker file looks like this:

FROM php:7.1-apache

RUN a2enmod rewrite remoteip

RUN set -ex \
        && buildDeps=' \
                libjpeg62-turbo-dev \
                libpng12-dev \
                libpq-dev \
        ' \
        && apt-get update && apt-get install -y --no-install-recommends $buildDeps mysql-client git unzip && rm -rf /var/lib/apt/lists/* \
        && docker-php-ext-configure gd \
                --with-jpeg-dir=/usr \
                --with-png-dir=/usr \
        && docker-php-ext-install -j "$(nproc)" exif gd mbstring opcache pdo pdo_mysql pdo_pgsql mysqli zip \
        && apt-mark manual \
                libjpeg62-turbo \
                libpq5 \
        && apt-get purge -y --auto-remove $buildDeps

RUN { \
                echo 'opcache.memory_consumption=128'; \
                echo 'opcache.interned_strings_buffer=8'; \
                echo 'opcache.max_accelerated_files=4000'; \
                echo 'opcache.revalidate_freq=60'; \
                echo 'opcache.fast_shutdown=1'; \
                echo 'opcache.enable_cli=1'; \
        } > /usr/local/etc/php/conf.d/opcache-recommended.ini

COPY . /var/www/html
WORKDIR /var/www/html
RUN rm -rf /var/www/html/vendor/* \
    && php /var/www/html/composer.phar config -g github-oauth.github.com k092739874283749823jg732989839283 \
    && php /var/www/html/composer.phar -n install \
    && php /var/www/html/composer.phar -n update \
    && rm -f /var/www/html/composer.phar \
    && chown -R www-data:www-data /var/www/html

[wglambert]

Is this relevant #662

You might need to change php:7.1-apache to php:7.1-apache-jessie

[yosifkit]

Answered in reply to your other comment in #485:

@alexsabau86 did you apt-get purge --auto-remove libpng-dev after using docker-php-ext-install? Unless you specifically also installed libpng16-16 it would be removed in the purge and thus the .so would be missing.

#485 (comment)

So change libpng12-dev to libpng-dev and add libpng16-16 to your apt mark manual. Or switch to the -jessieversion of the image as suggested above.