( concat "C:/cygwin/usr/local/bin" path-separator "C:/cygwin/usr/bin" path-separator "C:/cygwin/bin" path-separator Here's the elisp code to set environment variable within emacs only: example of setting env var named “path”, by appending a new path to existing path You want cygwin's bin paths in emacs, but you don't necessarily want them when running cmd.exe in Windows console, because you might want that to stay pure Windows. You might want to do this if you are using Cygwin. You can also set environment variables within emacs without setting them in the Operating System. Setting Environment Variable within Emacs This way, it'll inherit shell's environment variables. On Mac OS X, you can start GUI emacs from shell, like this: nohup /Applications/Emacs.app/Contents/MacOS/Emacs &. On Mac OS X, when you start emacs from GUI, emacs does not inherit environment variables from your shell, but does inherit the system-wide environment variables from ~/.MacOSX/ist.On Windows, you can start GUI emacs from Windows Console (cmd.exe) or PowerShell. (on Windows, perm env var is stored in the Registry.
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