Multiple fixes for sendfile() where running kernel is not the same on the compilation machine and the running machine (mainly packages): sendfile() support is checked more thoroughly for (a runtime check at configure checking that we just don't have a libc wrapper). A sendfile()-enabled version can now also survive without sendfile(). There is a new flag (--with(out)-linux-sendfile) that forces the status to on/off (both RH and Debian packages now supply this flag).