xnus@xnus-P43E:/opt/crosstool-ng-1.20.0$ mkdir ./crosstool-ng-1.20.0_build
xnus@xnus-P43E:/opt/crosstool-ng-1.20.0$ mkdir ./crosstool-ng-1.20.0_install

xnus@xnus-P43E:/opt/crosstool-ng-1.20.0/samples/arm-unknown-linux-gnueabi$ cp -Rf ./* /opt/crosstool-ng-1.20.0/crosstool-ng-1.20.0_build/

xnus@xnus-P43E:/opt/crosstool-ng-1.20.0/crosstool-ng-1.20.0_build$ mv crosstool.config .config

xnus@xnus-P43E:/opt/crosstool-ng-1.20.0$ ./configure --prefix=/opt/crosstool-ng-1.20.0/crosstool-ng-1.20.0_install

xnus@xnus-P43E:/opt/crosstool-ng-1.20.0$ make

xnus@xnus-P43E:/opt/crosstool-ng-1.20.0$ make install

xnus@xnus-P43E:/opt/crosstool-ng-1.20.0$ echo "PATH=$PATH:/opt/crosstool-ng-1.20.0/crosstool-ng-1.20.0_install/bin" >> ~/.bashrc

xnus@xnus-P43E:/opt/crosstool-ng-1.20.0$ source ~/.bashrc

xnus@xnus-P43E:/opt/crosstool-ng-1.20.0$ ct-ng help

xnus@xnus-P43E:/opt/crosstool-ng-1.20.0/crosstool-ng-1.20.0_build$ ct-ng menuconfig

xnus@xnus-P43E:/opt/crosstool-ng-1.20.0/crosstool-ng-1.20.0_build$ ct-ng build

Linux,crosstool-ng 1.20.0 install,Ubuntu 14.04 LTS