The authentication scheme files are located under the $openssozipdir/integrations/oracle/oamauth/solaris directory.
Download and configure the OpenSSO C-SDK 2.2 version.
The authn_api.c file contains a reference to AMAgent.propeties file. Modify the file accordingly.
Customize makefile for your environment.
For example, specify the gcc compile location. Also edit the LDFLAGS to point to your OpenSSO C-SDK lib directory.
Run the make command.
The make command should result in an authn_api.so file.