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In some situations, make will need to create its own temporary files.
These files must not be disturbed while make is running, including all
recursively-invoked instances of make.
If the environment variable MAKE_TMPDIR is set then all temporary files
created by make will be placed there.
If MAKE_TMPDIR is not set, then the standard location for temporary
files for the current operating system will be used. For POSIX systems this
will be the location set in the TMPDIR environment variable, or else
the system’s default location (e.g., /tmp) is used. On Windows,
first TMP then TEMP will be checked, then TMPDIR, and
finally the system default temporary file location will be used.
Note that this directory must already exist or make will fail:
make will not attempt to create it.
These variables cannot be set from within a makefile: GNU make
must have access to this location before it begins reading the makefiles.