The code in dbd/apr_dbd_odbc.c seems to build fine with it, after adding correct includes and lib. iodbc-config provides those, so unless you ever decide to use unixODBC specific extensions, for support only modifying APU_CHECK_DBD_ODBC macro in build/dbd.m4, to make it possible to select one of them, should be enough. Hard to tell, if the testsuite works, cause it does open the driver, but fails due to missing data source, but pg drivers fails in the same way, so that's probably OK.