See How to set environment variables in Windows. Http_proxy, https_proxy - used on Linux to specify an HTTP(S) proxy SYSFS_PATH - Use if sysfs is mounted somewhere other than /sys QT_QPA_PLATFORM - On Linux set this to wayland to force calibre to use Wayland and xcb to force use of X11. Useful for calibre developers.ĬALIBRE_NO_DEFAULT_PROGRAMS - prevent calibre from automatically registering the filetypes it is capable of handling with Windows. The system theme – beware of crashes and hangs.ĬALIBRE_SHOW_DEPRECATION_WARNINGS - causes calibre to print deprecation warnings to stdout. You set this environment variable on Linux, it will cause calibre to use Theĭownside is that calibre may not follow the system look and feel. This is to avoid crashes and hangs caused by incompatibilitiesīetween the version of Qt calibre is built against and the system Qt. The menu is instead placed inside the window, as is traditional.ĬALIBRE_USE_SYSTEM_THEME - by default, on Linux, calibre uses its ownīuiltin Qt style. po file)ĬALIBRE_NO_NATIVE_FILEDIALOGS - causes calibre to not use native file dialogs for selecting files/folders.ĬALIBRE_NO_NATIVE_MENUBAR - causes calibre to not create a native (global) menu on Ubuntu Unity and similar Linux desktop environments. See Setting up a calibre development environment.ĬALIBRE_OVERRIDE_LANG - used to force the language used by the interface (ISO 639 language code)ĬALIBRE_TEST_TRANSLATION - used to test a translation. Useful if your library folder is on a networked drive that does not support file locking.ĬALIBRE_DEVELOP_FROM - used to run from a calibre development environment. Using this variable you can have metadata.db be in a location other than the library folder. CALIBRE_CONFIG_DIRECTORY - sets the folder where configuration files are stored/read.ĬALIBRE_TEMP_DIR - sets the temporary folder used by calibreĬALIBRE_CACHE_DIRECTORY - sets the folder calibre uses to cache persistent data between sessionsĬALIBRE_OVERRIDE_DATABASE_PATH - allows you to specify the full path to metadata.db.

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