Symantec fixed the bug in THINK C 5.0.3 that we mentioned in TidBITS-149 and has made an updater available for FTP on <sumex-aim.stanford.edu> as:
The update corrects problems with the Quadra, the code motion optimization, and other problems present in earlier versions. The file also includes a TCL (THINK Class Libraries) update that is identical to the one from the 5.0.2 and 5.0.3 updates. If you are currently using version 5.0 or 5.0.1 and use the TCL, you need this update.
If you have any questions about this update, or about THINK C or THINK Pascal in general, please send them to Languages Tech Support at:
Phil Shapiro -- firstname.lastname@example.org