.cindex "environment"
If &%environment%& is given as an argument, the set of environment
-variables is output, line by line. Using the &%-n%& flag supresses the value of the
+variables is output, line by line. Using the &%-n%& flag suppresses the value of the
variables.
.cindex "options" "macro &-- extracting"
Curve names of the form &'prime256v1'& are accepted.
For even more-recent library versions, names of the form &'P-512'&
are also accepted, plus the special value &'auto'&
-which tell the library to choose.
+which tells the library to choose.
If the option is set to an empty string, no EC curves will be enabled.