when ../configure, cannot find Ninjia

On unbuntu18.04, after finishing 

wget https://download.qemu.org/qemu-5.2.0-rc0.tar.xz
tar xvJf qemu-5.2.0-rc0.tar.xz
cd qemu-5.2.0-rc0

when I input 

wget https://download.qemu.org/qemu-5.2.0-rc0.tar.xz
tar xvJf qemu-5.2.0-rc0.tar.xz
cd qemu-5.2.0-rc0

Return Error:
cannot find Ninjia