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/** @page env Environment variables
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@section LIBQUVI_EXCLUSIVE_SCRIPTS_DIR
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When defined, the library will *only* use those scripts found at the
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directories specified by the LIBQUVI_SCRIPTS_DIR.
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@note Useful, for example, when the current set of the scripts at
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$top_srcdir/share/ (of libquvi-scripts) are being tested by the
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testsuite of the libquvi-scripts. The library would, otherwise,
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include the scripts from the libquvi-scripts instance built with
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the library and likely interfere with the tests.
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@section LIBQUVI_SCRIPTS_DIR
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When defined, the library will additionally look in the colon-separated list of
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directories specified by the LIBQUVI_SCRIPTS_DIR environment variable.
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@section LIBQUVI_SHOW_DIR
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When defined, the library will output the paths of the searched directories to
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the stderr.
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@section LIBQUVI_SHOW_SCRIPT
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When defined, the library will output the file names of the found scripts to stderr.
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The output will also indicate whether the script was accepted by the library.
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@section LIBQUVI_SCRIPTS_VERBOSE
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When defined, scripts using the 'quvi/debug' module messaging functions will output
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to stderr.
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@section Proxy
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Refer to the libcurl C API, or curl(1), documentation for a complete list of the
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supported environment variables. libquvi uses libcurl to access the Internet.
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@sa http://curl.haxx.se/libcurl/c/curl_easy_setopt.html#CURLOPTPROXY
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*/
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