компилировать стандартные программы на C (compile standard C programs)
Переменные окружения (Environment variables)
The following environment variables shall affect the execution of
c99:
LANG Provide a default value for the internationalization
variables that are unset or null. (See the Base
Definitions volume of POSIX.1‐2017, Section 8.2,
Internationalization Variables for the precedence of
internationalization variables used to determine the
values of locale categories.)
LC_ALL If set to a non-empty string value, override the values
of all the other internationalization variables.
LC_CTYPE Determine the locale for the interpretation of
sequences of bytes of text data as characters (for
example, single-byte as opposed to multi-byte
characters in arguments and input files).
LC_MESSAGES
Determine the locale that should be used to affect the
format and contents of diagnostic messages written to
standard error.
NLSPATH Determine the location of message catalogs for the
processing of LC_MESSAGES.
TMPDIR Provide a pathname that should override the default
directory for temporary files, if any. On XSI-
conforming systems, provide a pathname that shall
override the default directory for temporary files, if
any.
