If you want to compile source code for pcDuino(ARM) on other architecture PC like X86, you should get a cross-toolchain.

You can easily install arm cross-compiler on Ubuntu 14.04 as follows:

sudo apt-get install libc6:i386 libstdc++6:i386 libncurses5:i386 zlib1g:i386
sudo apt-get install gcc-4.8-arm-linux-gnueabihf
sudo apt-get install libncurses5-dev libncursesw5-dev device-tree-compiler u-boot-tools

This will install Linaro cross-toolchain version 4.8 on Ubuntu 14.04, but if you want to install other version like 4.7, you can take the following commands:

sudo add-apt-repository ppa:linaro-maintainers/toolchain
sudo apt-get update
sudo apt-get install gcc-4.7-arm-linux-gnueabi

You might want additional tools for building a Linux system that are not related to the cross-compiler:

apt-get install build-essential git debootstrap u-boot-tools device-tree-compiler