+# All of the pdo-foo USE flags could require USE=foo, but this has an
+# unwanted side effect. USE=mysql, for example, also enables the old
+# deprecated mysql database driver. We would like it to be possible to
+# install pdo-mysql without the deprecated mysql driver, so we don't
+# require USE=mysql with USE=pdo-mysql. This means that we have to
+# reproduce the mysql? (...) dependencies for pdo-mysql in (R)DEPEND
+# above.