Got link error: ld: library not found for -lcrtl.10.6.0

[peterauser]

Got link error: ld: library not found for -lcrtl.10.6.0
when building a program that once worked.
Any idea about what I did to cause this and what I have to do to fix it?
On Mac OS 10.9.4
and
ABsoft PRO Fortran 13.0.3

[forumadmin]

You are probably trying to target an O/S that is not supported with your current version of Xcode. Go to:

Project | Project Options | Target

and change the "Target OS" to "Current Host OS"