# Portability

- Are my Logtalk applications portable across Prolog compilers?

- Are my Logtalk applications portable across operating systems?

## Are my Logtalk applications portable across Prolog compilers?

Yes, as long you don’t use built-in predicates or special features only available on some Prolog compilers. There is a portability compiler flag that you can set to instruct Logtalk to print a warning for each occurrence of non-ISO Prolog standard features such as proprietary built-in predicates. In addition, it is advisable that you constrain, if possible, the use of platform or compiler dependent code to a small number of objects with clearly defined protocols. You may also use Logtalk support for conditional compilation to compile different entity or predicate definitions depending on the backend Prolog compiler being used.

## Are my Logtalk applications portable across operating systems?

Yes, as long you don’t use built-in predicates or special features that your chosen backend Prolog compiler only supports on some operating-systems. You may need to change the end-of-line characters of your source files to match the ones on the target operating system and the expectations of your Prolog compiler. Some Prolog compilers silently fail to compile source files with the wrong end-of-line characters.