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BUFSIZ is undefined leading to error during compile. Normally BUFSIZ is defined by c compiler environment for standard IO and varies depending on environment.

from https://c-programming-know-how.blogspot.com/2014/03/what-is-bufsiz.html

"BUFSIZ is a constant macro representing the size of the input buffer. It is defined in stdio.h and represents the size for your C implementation. ANSI C requires that it be at least 256 bytes."

rz.c and sz.c include the signal.h header file but CP/M does not support Unix style signals. Need to make adjustments to code to replace this functionality with equivalent for CP/M

the termio.h is "included" in rbsb.c but is not available in z88dk environment. Obtained similar vintage termio.h file from SysIII/SysV archive but does not provide expected defines resulting in compilation errors. Need to obtain different termio.h or make adjustments to match expected values