To build RSAREF, copy the makefile for your operating system from the'install' subdirectory to a new subdirectory. Then run your operatingsystem's 'make' program from the new subdirectory. The makefile willcompile the RSAREF source code and build the demonstration program.Makefiles are found in subdirectories of the 'install' subdirectory:     dos       Personal Computer running DOS, Microsoft C v8.0     mac       Macintosh running System 7, MPW 3.2     unix      NeXTStation, DECStation 3100, SPARCStation 1For example, suppose you are running DOS with Microsoft's NMAKEutility. From the new directory you would run the commands:     copy ..\install\dos\makefile     nmakeNote that when you transfer RSAREF to another operating system, thefollowing files in the 'rdemo/scripts' subdirectory should betransferred in binary mode:    - signatures: *.sig    - initialization vectors: *.iv    - envelopes: *.env    - encrypted keys: *.key (excluding RSA key pairs in 508.key,        767.key, 1024.key)All other RSAREF files should be transferred in text mode.