org-latex-listings

org-latex-listings is a variable defined in `ox-latex.el'.
Its value is

nil

Documentation:
Non-nil means export source code using the listings package.

This package will fontify source code, possibly even with color.
If you want to use this, you also need to make LaTeX use the
listings package, and if you want to have color, the color
package. Just add these to `org-latex-packages-alist', for
example using customize, or with something like:

(require 'ox-latex)
(add-to-list 'org-latex-packages-alist '("" "listings"))
(add-to-list 'org-latex-packages-alist '("" "color"))

Alternatively,

(setq org-latex-listings 'minted)

causes source code to be exported using the minted package as
opposed to listings. If you want to use minted, you need to add
the minted package to `org-latex-packages-alist', for example
using customize, or with

(require 'ox-latex)
(add-to-list 'org-latex-packages-alist '("" "minted"))

In addition, it is necessary to install pygments
(http://pygments.org), and to configure the variable
`org-latex-pdf-process' so that the -shell-escape option is
passed to pdflatex.

The minted choice has possible repercussions on the preview of
latex fragments (see `org-preview-latex-fragment'). If you run
into previewing problems, please consult

http://orgmode.org/worg/org-tutorials/org-latex-preview.html

You can customize this variable.