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+?RCS: Copyright (c) 2015 Raphael Manfredi
+?RCS: You may redistribute only under the terms of the Artistic License,
+?RCS: as specified in the README file that comes with the distribution.
+?RCS: You may reuse parts of this distribution only within the terms of
+?RCS: that same Artistic License; a copy of which may be found at the root
+?RCS: of the source tree for dist 4.0.
+?MAKE:d_clearenv: Trylink cat i_stdlib
+?MAKE: -pick add $@ %<
+?S: This variable conditionally defines the HAS_CLEARENV
+?S: symbol, which indicates to the C program that clearenv()
+?S: is available to clear the environment.
+?C: This symbol is defined when clearenv() is there to clear the
+?LINT: set d_clearenv
+: do we have clearenv?
+$cat >try.c <<EOC
+ return clearenv();