unable to use "-net user" argument after building from master branch

[Neal Elliott]

hello, 
            I'm unable to use the "-net user" argument with the compiled 
"qemu-system-x86_64" binary. I get an error: "qemu-system-x86_64: -net user: 
network backend 'user' is not compiled into this binary"

I don't know what I'm missing when I used the configure script with the 
following arguments:

 ../configure --enable-linux-user --enable-user --enable-curses 
--enable-vhost-net --enable-vhost-user --enable-png

what am I doing wrong? what other arguments do I need to add to allow the "-net 
user" option to work?