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### 4.1 Customizable variables

This section summarizes variables used for Flymake configuration.

`flymake-log-level`
  Controls logging output, see Troubleshooting.
`flymake-allowed-file-name-masks`
  A list of `(filename-regexp, init-function, cleanup-function getfname-function)` for configuring syntax check tools. See Adding support for a new syntax check tool.
`flymake-buildfile-dirs`
  A list of directories (relative paths) for searching a buildfile. See Locating the buildfile.
`flymake-master-file-dirs`
  A list of directories for searching a master file. See Locating a master file.
`flymake-get-project-include-dirs-function`
  A function used for obtaining a list of project include dirs (C/C++ specific). See Getting the include directories.
`flymake-master-file-count-limit`
`flymake-check-file-limit`
  Used when looking for a master file. See Locating a master file.
`flymake-err-line-patterns`
  Patterns for error/warning messages in the form `(regexp file-idx line-idx col-idx err-text-idx)`. See Parsing the output.
`flymake-compilation-prevents-syntax-check`
  A flag indicating whether compilation and syntax check of the same file cannot be run simultaneously.
`flymake-no-changes-timeout`
  If any changes are made to the buffer, syntax check is automatically started after `flymake-no-changes-timeout` seconds.
`flymake-gui-warnings-enabled`
  A boolean flag indicating whether Flymake will show message boxes for non-recoverable errors. If `flymake-gui-warnings-enabled` is `nil`, these errors will only be logged to the `*Messages*` buffer.
`flymake-start-syntax-check-on-newline`
  A boolean flag indicating whether to start syntax check after a newline character is added to the buffer.
`flymake-errline`
  A custom face for highlighting lines for which at least one error has been reported.
`flymake-warnline`
  A custom face for highlighting lines for which at least one warning and no errors have been reported.