./configure --prefix=/var/ftp/pub/myhttp/apache --build=linuxformxs --host=linuxformxs --target=linuxformxs --enable-so --with-apr=/var/ftp/pub/myhttp/apr --with-apr-util=/var/ftp/pub/myhttp/apr-util
checking for chosen layout... Apache
checking for working mkdir -p... yes
checking build system type... Invalid configuration `linuxformxs': machine `linuxformxs' not recognized
configure: error: /bin/sh build/config.sub linuxformxs failed


这里的 --build --host -target 到底是什么意思