$ docker-compose up -d apache mysql
...
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 libpng12-dev curl' returned a non-zero code: 100
$ docker-compose up -d apache mysql ... 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 libpng12-dev curl' returned a non-zero code: 100