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\section{Environment variables}\label{envvars}
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%\setheader{{\it CHAPTER \thechapter}}{}{}{}{}{{\it CHAPTER \thechapter}}%
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%\setfooter{\thepage}{}{}{}{}{\thepage}%
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This section describes all environment variables that affect execution of
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wxWidgets programs.
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\twocolwidtha{5cm}%
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\begin{twocollist}\itemsep=0pt
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\twocolitem{\tt{WXTRACE}}{(Debug build only.)
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This variable can be set to comma-separated list of trace masks used in
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\helpref{wxLogTrace}{wxlogtrace} calls;
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\helpref{wxLog::AddTraceMask}{wxlogaddtracemask} is called for every mask
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in the list during wxWidgets initialization.}
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\twocolitem{\tt{WXPREFIX}}{(Unix only.)
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Overrides installation prefix. Normally, the prefix
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is hard-coded and is same as the value passed to {\tt configure} via
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the {\tt --prefix} switch when compiling the library (typically
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{\tt /usr/local} or {\tt /usr}). You can set WXPREFIX if you are for example
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distributing binary version of an application and you don't know in advance
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where it will be installed.}
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\twocolitem{\tt{WXMODE}}{(wxMGL only.)
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Sets MGL video mode. The value must be in form
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{\it width}x{\it height}-{\it depth}. The default is {\tt 640x480-16}.}
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\twocolitem{\tt{WXSTDERR}}{(wxMGL only.)
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Redirects stderr output to a file.}
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\end{twocollist}
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