Controversial Linux World article

LinuxWorld has an article which may have some valid points, but would discourage me from porting my apps to Linux. How many of you have had difficulties porting from libc to glibc? (Please only answer if you tried it). How different are the different distributions for your app? How much does autoconfig solve? Any people from Red Hat, Debian, SuSe, Caldera, PHT, etc are encouraged to relate their experience. S: My comments are that Ian Nandhra was one of the founders of the LSA, and that his article is inaccurate in assuming that software will be sold at a 60 percent discount.