A coworker of mine made a presentation in front of an IBM Linux Council on his experience migrating an old C language application from Sun Solaris to Linux on Z. The major effort was in 32 to 64 bit issues, endianness, miscastings, migration across two generations of ANSI standards, application polling differences on new hardware, and surrounding infrastructure differences (gcc, make, etc). However long you think its going to take, double it and change to the next larger units of time.
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