In general, you will not need to recompile a PAM-aware application before using a PAM module. PAM (Pluggable Authentication Modules) is a system for dynamically configuring authentication on a Unix or Linux system. PAM-aware applications use PAM to authenticate users and perform other authentication-related tasks.
To use a PAM module with a PAM-aware application, you will need to configure the module in the PAM configuration files. PAM configuration files are located in the /etc/pam.d/ directory and contain rules for how PAM should authenticate users and perform other tasks.
To use a PAM module with a PAM-aware application, you will need to include the module's name and any required options in the appropriate PAM configuration file. For example, if you want to use a PAM module called pam_foo with the login application, you would add the following line to the /etc/pam.d/login file:
auth optional pam_foo.so
Once you have added the module to the PAM configuration file, you will need to restart the application or service that uses PAM in order for the changes to take effect.
It's important to note that some PAM modules may require additional libraries or packages to be installed on the system before they can be used. Consult the documentation for the PAM module and the application or service you are using for more information on how to use PAM modules.