Question

I am trying to use CMake and I need to add an environment variable GSL_ROOT_DIR in windows 7, so that %GSL_ROOT_DIR%\include contains the GSL header files and %GSL_ROOT_DIR%\lib contains the GSL libraries.
Could you tell me exactly how can I do that?

Answer 1

• Press the start button. (alternatively: windows key + r, then sysdm.cpl)
• right click “Computer” then click properties.
• Click advanced system settings.
• Click Environment variables.
• Add the variable you need + the correct path.

EDIT:

point %GSL_ROOT_DIR% to the base directory of where you extracted the GSL library. I.e. if you downloaded the developer files from here and extracted it to c:\libs\gsl\ then your %GSL_ROOT_DIR% should be “C:\libs\gsl” (if you look at the zip file, it contains both an include, and a lib folder).