-To build sudo from the source distribution you need a nominally
-POSIX-compliant operating system (any modern version of BSD, Linux
-or UNIX should work), a working ANSI/ISO C compiler (C89 or higher),
-and the ar, make and ranlib utilities
+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.