D7762.diff
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	diff --git a/src/future/exec/ExecFuture.php b/src/future/exec/ExecFuture.php
	--- a/src/future/exec/ExecFuture.php
	+++ b/src/future/exec/ExecFuture.php
	@@ -186,6 +186,29 @@
	}


	+ /**
	+ * Set the value of a specific environmental variable for this command.
	+ *
	+ * @param string Environmental variable name.
	+ * @param string\|null New value, or null to remove this variable.
	+ * @return this
	+ * @task config
	+ */
	+ public function updateEnv($key, $value) {
	+ if (!is_array($this->env)) {
	+ $this->env = $_ENV;
	+ }
	+
	+ if ($value === null) {
	+ unset($this->env[$key]);
	+ } else {
	+ $this->env[$key] = $value;
	+ }
	+
	+ return $this;
	+ }
	+
	+
	/* -( Interacting With Commands )------------------------------------------ */