preview-latex not working in Emacs.app

I just installed auctex and preview-latex on my mac, and now when I open a tex document I see auctex has been loaded, but when I try to generate a preview I get the following error message:

``````Running `Preview-LaTeX' on `writeup' with ``latex  "\nonstopmode\nofiles\PassOptionsToPackage{active,tightpage,auctex}{preview}\AtBeginDocument{\ifx\ifPreview\undefined\RequirePackage[displaymath,floats,graphics,textmath,sections,footnotes]{preview}[2004/11/05]\fi}" "\input" writeup.tex''

Preview-LaTeX exited as expected with code 127 at Tue Jan 18 20:01:34
LaTeX: LaTeX found no preview images
``````

What is going wrong here? LaTeX is in my path, at least at the terminal. For Emacs when I run M-x getenv PATH I don't see the LaTeX installation in my path. I created a file ~/.MacOSX/environment.plist with the following lines:

``````<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd";>
<plist version="1.0">
<dict>
<key>PATH</key>
<string>/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/X11/bin:/usr/texbin</string>
</dict>
</plist>
``````

But that didn't change my PATH variable in Emacs.app at all.

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Emacs internally uses the `exec-path` variable to determine what it looks for.

This is normally initialised to PATH, but not if it is customised. Check its value using `c-h v exec-path`; there's a link there to the customise submenu. If you delete the relevant line from your customisation file (see the value of the Emacs variable `custom-file`), you can force the default behaviour.

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My custom.el just has two calls in it: (custom-set-variables) and (custom-set-faces) But the path I see when I look at exec-path is different from the PATH. –  Ranjit Jan 20 '11 at 19:03
What happens when you setq exec-path in your Emacs initialisation file? –  Charles Stewart Jan 20 '11 at 19:29
Actually it seems to be working now. I rebooted my computer and that seems to have caused Emacs.app to start reading the environment.plist file. –  Ranjit Jan 20 '11 at 20:00

You need a LaTeX installation. Make sure the directory where the `latex` executable lives is inside your `PATH`.

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Sorry I should have been clearer. There is some kind of PATH problem, but I do have LaTeX installed and I can run it from the terminal just fine. Emacs.app isn't aware of it for some reason though. –  Ranjit Jan 19 '11 at 13:51