Commandline required to compile a "Windows 7" version of "asdfinal.exe":
We used the Lahey (Fujitsu) C compiler (version 3.0)
	>fcc /V
	fcc: Fujitsu C Compiler Driver Version 3.0
	usage: fcc [options] files

>fcc asdfinal.c getopt.c erf.c isinf4.c -o asdfinal.exe

Commandline required to compile a "Cygwin" (Windows) version of "asdfinal_cygwin64.exe":
We used the cygwin (64 bit) gnu compiler (version 5.4.0)
	$ gcc --version
	gcc (GCC) 5.4.0
	Copyright (C) 2015 Free Software Foundation, Inc.
	This is free software; see the source for copying conditions.  There is NO
	warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

$ gcc  asdfinal.c getopt.c -lm  -o asdfinal_cygwin64.exe