Why do I get compile errors building Perl DBD::ODBC on AIX?

The DBD::ODBC source code contains C++ comments. Some AIX compilers don't accept C++ comments. You can either convert the C++ comments in dbdimp.c to normal C comments, so:

// This is a C++ comment

becomes:

/* This is C comment */

or add -qcpluscmt to the generated makefile.