-To build sudo from the source distribution you need a machine running
-Unix (most flavors of BSD, SYSV, or POSIX will do), a working C
-compiler, and the make utility.
+To build sudo from the source distribution you need a POSIX-compliant
+operating system (any modern version of BSD, Linux or Unix should
+work), an ANSI/ISO C compiler that supports variadic marcos (a C99
+feature) and the ar, make and ranlib utilities.