You have two options:

1. Directly use your library by adding it to project in xcode, assign a library search path, assign header search path and incude headers in .mm objective-c source code that use it.
2. Add all .c files to be compiled and linked by xcode and incude headers in .mm objective-c source code that use it.

p.s. if you have used some particular compiler switches you may need to rebuild your libraries to properly target iOS.

You have two options:

1. Directly use your library by adding it to project in xcode, assign a library search path, assign header search path and incude headers in .m objective-c source code that use it.
2. Add all .c files to be compiled and linked by xcode and incude headers in .m objective-c source code that use it.

p.s. if you have used some particular compiler switches you may need to rebuild your libraries to properly target iOS.