如何只编译qemu arm，请参考下面的操作步骤。

How to build qemu-system-arm in Linux

Most (all?) Linux distributions have a binary package for qemu-system (including qemu-system-arm) in order to emulate non-x86 targets such as ARM, MIPS, PPC, Alpha and more.

However, in some case you may need to very latest version of qemu-system and it may not be able yet for your distribution.

Here’s how to do to build qemu-system-arm without building all qemu-system-***:

Download the latest stable version of qemu (qemu 1.0.1 at the time this post was written):
wget http://wiki.qemu.org/download/qemu-1.0.1.tar.gz

or get the latest source code (development tree) which has the very latest features and bug fixes, but may not work or compile:
git clone git://git.qemu.org/qemu.git

or get the latest source code from linaro (which may be more up-to-date for ARM targets):
git clone git://git.linaro.org/qemu/qemu-linaro.git
Configure qemu to build ARM targets:
cd qemu ./configure --target-list=arm-softmmu,arm-linux-user
Build and install qemu-system-arm:
make -j 2 sudo make install
Verify the latest version of qemu-ssytem-arm is installed:
# qemu-system-arm --version QEMU emulator version 1.0,1, Copyright (c) 2003-2008 Fabrice Bellard

内容引自 https://www.cnx-software.com/2012/03/08/how-to-build-qemu-system-arm-in-linux/