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(environment-variables)=
# Environment Variables Impacting the Build System
Various environment variables have an impact on the behavior of the
build system. This document attempts to document them.
AUTOCLOBBER
: If defines, the build system will automatically clobber as needed.
The default behavior is to print a message and error out when a
clobber is needed.
This variable is typically defined in a {ref}`mozconfig <mozconfig>`
file via `mk_add_options`.
REBUILD_CHECK
: If defined, the build system will print information about why
certain files were rebuilt.
This feature is disabled by default because it makes the build slower.
MACH_NO_TERMINAL_FOOTER
: If defined, the terminal footer displayed when building with mach in
a TTY is disabled.
MACH_NO_FUNC_CACHE
: If defined, disables mach's persistent function result cache. This
cache speeds up operations like configure by avoiding redundant
expensive computations when input files haven't changed.
MACH_NO_WRITE_TIMES
: If defined, mach commands will not prefix output lines with the
elapsed time since program start. This option is equivalent to
passing `--log-no-times` to mach.