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diff --git a/nihil.posix/posix.getenv.ccm b/nihil.posix/posix.getenv.ccm
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+++ b/nihil.posix/posix.getenv.ccm
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+/*
+ * This source code is released into the public domain.
+ */
+
+module;
+
+#include <expected>
+#include <string>
+
+export module nihil.posix:getenv;
+
+import nihil.error;
+
+namespace nihil {
+
+/*
+ * Find a variable by the given name in the environment by calling getenv_r().
+ */
+
+export [[nodiscard]] auto getenv(std::string_view varname)
+	-> std::expected<std::string, error>;
+
+} // namespace nihil