Created attachment 1426478 [details]
spec file for a drupal8 extension module that spews warnings and errors when being built

Description of problem:
When building an rpm for a drupal8 module, I use drupal8-rpmbuild.  Building the rpm then spews a lot of PHP Warning and PHP Fatal error messages about a call to require_once failing.  The problem is, the script /usr/lib/rpm/drupal8-find-provides.php which is called during the build contains the lines

require_once '/usr/share/php/Symfony3/Component/Console/autoload.php';
require_once '/usr/share/php/Symfony3/Component/Yaml/autoload.php';

but those files are not on the system.  They should be included as dependency of drupal8-rpmbuild.

My suggestion (but feel free to improve) is to add
Requires: php-symfony3-console, php-symfony3-yaml
to the list of requirements for drupal8-rpmbuild.

Version-Release number of selected component (if applicable):
drupal8-rpmbuild-8.4.6-3.fc27.noarch

How reproducible:
100%

Steps to Reproduce:
1.Build an RPM for a drupal8 extension module, preferably using mock (to get a clean build environment).  The spec file should contain BuildRequires: drupal8-rpmbuild.  (See the attachment)
2.
3.

Actual results:
Lots of messages:
PHP Warning:  require_once(/usr/share/php/Symfony3/Component/Console/autoload.php): failed to open stream: No such file or directory in /usr/lib/rpm/drupal8-find-provides.php on line 31
PHP Fatal error:  require_once(): Failed opening required '/usr/share/php/Symfony3/Component/Console/autoload.php' (include_path='.:/usr/share/pear:/usr/share/php') in /usr/lib/rpm/drupal8-find-provides.php on line 31


Expected results:
No such messages.

Additional info:
I attached a spec file demonstrating the problem.
Uncomment the two BuildRequires lines to not get the warnings and errors.