How to use CMAKE_INSTALL_PREFIX

That should be (see the docs):

cmake -DCMAKE_INSTALL_PREFIX=/usr ..

There are two ways to use this variable:

• passing it as a command line argument just like Job mentioned:

  cmake -DCMAKE_INSTALL_PREFIX=< install_path > ..

• assigning value to it in CMakeLists.txt:

  SET(CMAKE_INSTALL_PREFIX < install_path >)

  But do remember to place it BEFORE PROJECT(< project_name>) command, otherwise it will not work!

But do remember to place it BEFORE PROJECT(< project_name>) command, otherwise it will not work!

My first week of using cmake - after some years of GNU autotools - so I am still learning (better then writing m4 macros), but I think modifying CMAKE_INSTALL_PREFIX after setting project is the better place.

CMakeLists.txt

cmake_minimum_required (VERSION 2.8)set (CMAKE_INSTALL_PREFIX /foo/bar/bubba)message("CIP = ${CMAKE_INSTALL_PREFIX} (should be /foo/bar/bubba")project (BarkBark)message("CIP = ${CMAKE_INSTALL_PREFIX} (should be /foo/bar/bubba")set (CMAKE_INSTALL_PREFIX /foo/bar/bubba)message("CIP = ${CMAKE_INSTALL_PREFIX} (should be /foo/bar/bubba")

First run (no cache)

CIP = /foo/bar/bubba (should be /foo/bar/bubba-- The C compiler identification is GNU 4.4.7-- etc, etc,...CIP = /usr/local (should be /foo/bar/bubbaCIP = /foo/bar/bubba (should be /foo/bar/bubba-- Configuring done-- Generating done

Second run

CIP = /foo/bar/bubba (should be /foo/bar/bubbaCIP = /foo/bar/bubba (should be /foo/bar/bubbaCIP = /foo/bar/bubba (should be /foo/bar/bubba-- Configuring done-- Generating done

Let me know if I am mistaken, I have a lot of learning to do. It's fun.