+ * DESTDIR: if specified, install to this directory instead of $prefix.
+ * version_suffix=yes/no/something : if specified, this suffix will be
+ appended to the user data directory.
+ * win_installer: if specified under windows, and if 'installer' target
+ is given, generate NSIS installer specifed as win_installer which can
+ be a full path name. The default is lyx-version-timestamp-Installer.exe
+ for a development version, and lyx-version-Installer.exe for a released
+ version.