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-rw-r--r--src/libutil/util.hh3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/libutil/util.hh b/src/libutil/util.hh
index 1b0600006a..d9ca1dac22 100644
--- a/src/libutil/util.hh
+++ b/src/libutil/util.hh
@@ -55,6 +55,9 @@ typedef set<Path> PathSet;
 extern string thisSystem;
 
 
+/* Return an environment variable. */
+string getEnv(const string & key, const string & def = "");
+
 /* Return an absolutized path, resolving paths relative to the
    specified directory, or the current directory otherwise.  The path
    is also canonicalised. */