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-rw-r--r--src/libexpr/eval.hh4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/libexpr/eval.hh b/src/libexpr/eval.hh
index bfaa4081d488..627fae3ff363 100644
--- a/src/libexpr/eval.hh
+++ b/src/libexpr/eval.hh
@@ -121,6 +121,10 @@ std::ostream & operator << (std::ostream & str, const Value & v);
 typedef list<std::pair<string, Path> > SearchPath;
 
 
+/* Initialise the Boehm GC, if applicable. */
+void initGC();
+
+
 class EvalState
 {
 public: