QOCIDriver: unable to create environment

[ChrisW67]

ORACLE_HOME is an environment variable, or on Windows a registry entry, that almost all Oracle utilities use to find, among other things, the Oracle client and connection information files. ORACLE_HOME has nothing to do with Qt specifically and is set outside your program. ORACLE_HOME is generally set by the Oracle client installer. I suggest you need to consult your Oracle DBA or Oracle documentation.

http://www.orafaq.com/wiki/ORACLE_HOME