-IRIX 6.5, OSF/1 5.1, Solaris 11 2010-11, Cygwin 1.7.1, mingw, MSVC 9, Interix 3.5, BeOS.
+IRIX 6.5, OSF/1 5.1, Solaris 11 2011-11, Cygwin 1.7.1, mingw, MSVC 9, Interix 3.5, BeOS.
+But the replacement function is not atomic; this matters in multi-threaded
+programs that spawn child processes.