How can I convert INFORMIX-SQL Version 11.50.FC3 schema to PostgreSQL 9.2 schema?
I did some conversions as Craig said:
dbexportof Informix database
psql -f [schema_file] new_database
psqloutput and if something is wrong drop new PostgreSQL database, and correct search & replace tools (goto 2)
When you convert all interesting things into PostgreSQL you can compare both schemas using my tools like: http://code.activestate.com/recipes/576621-dump-informix-schema-to-text/
Those tools are used mainly to compare Informix vs other Informix or PostgreSQL vs other PostgreSQL database but after some normalizing I believe you can compare PostgreSQL vs Informix.