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1. Window -> Preferences -> C/C++ -> Build -> Environment 2. Press Add, Add envvar: name=PATH, value=C:\tools;%PATH% 3. Press OK 4. build a project , success, because it can find make. 5. Window -> Preferences -> C/C++ -> Build -> Environment 6. Press Edit (non need to modify string), Press OK 7. Press OK to close preferences. 8. build project, fails because make is not found. Upon inspection of the PATH var in the project with Alt-Enter on the build/environment page it can be seen that i the first case %PATH% is expanded with the windows full OS path, in the secod case it is not expanded and is identical to the entered field, with %PATH% litarally. The same happens with variables like ${BUILDTOOL}.
