Detect if its Ubuntu Linux OS in Makefile

We use cat /etc/lsb-release for identifying the Ubuntu release:

sh-3.2$  cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=8.04
DISTRIB_CODENAME=hardy
DISTRIB_DESCRIPTION="Ubuntu 8.04.4 LTS"

For other releases it might be

ls /etc/*release

Gentoo, RedHat, Arch & SuSE all have a release file: http://linuxmafia.com/faq/Admin/release-files.html These is a complete script in the link ;)

Example code for operation system, architecture and version for Ubuntu type systems:

OS=$(shell lsb_release -si)
ARCH=$(shell uname -m | sed 's/x86_//;s/i[3-6]86/32/')
VER=$(shell lsb_release -sr)

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