12.2 Environment variables
Ipe, ipetoipe, and iperender respect the following
environment variables:
- IPELATEXDIR
-  the directory where Ipe runs Pdflatex.
- IPEFONTMAP
-  the complete path of the font map, describing where
  Ipe can find the 14 standard pdf fonts.
- IPEDEBUG
-  set to 1 for debugging output.
- IPEANCIENTPDFTEX
-  set this variable to use Pdftex versions older
  than 1.40.
The Ipe program uses several additional environment variables:
- EDITOR
-  external editor to use for editing text objects.
- IPESTYLES
-  a list of directories, separated by semicolons on
  Windows and colons otherwise, where Ipe looks for stylesheets, for
  instance for the standard stylesheet basic.isy. You can write
  _ (a single underscore) for the system-wide stylesheet directory.
  If this variable is not set, the default consists of the system-wide
  stylesheet directory, plus ~/.ipe/styles on Unix, plus
  ~/Library/Ipe/Styles on OS X.
- IPELETPATH
-  a list of directories, separated by semicolons on
  Windows and colons otherwise, containing ipelets. You can write _
  (a single underscore) for the system-wide ipelet directory. If this
  variable is not set, the default consists of the system-wide ipelet
  directory, plus ~/.ipe/ipelets on Unix, plus
  ~/Library/Ipe/Ipelets on OS X.
- IPEICONDIR
-  directory containing icons for the Ipe user interface.
- IPEDOCDIR
-  directory containing Ipe documentation.
- IPELUAPATH
-  path for searching for Ipe Lua code.