php5-fpm in Precise and later (as well as the Apache equivalent
libapache2-mod-php5 package for Apache built-in PHP5 modules) is listed as having
bcmath built in to it as an included module. This information is written in the package description file (
debian/control) in the package itself when extracted and being viewed as the raw source package, containing source code and a
debian/ directory which contains directives to debian build systems to build packages.
Given that the
php5-fpm system as well as the
libapache2-mod-php5 plugin for Apache has it included by default, I don't think you have to install any additional packages or plugins to get
In case my word isn't enough and you want to see the evidence of this, then...
This is a list of links to the
debian/rules file which defines which extensions are enabled in PHP at the time of building for each currently supported release at the time of this post (there may be updates after this post that are not reflected here). You can click each of these to see the
./configure arguments that are passed to
php5 during the building process for those packages. Note that this will show you specifically where
bcmath is enabled for all
php5 binaries in those releases: