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-rw-r--r--src/libstore/build.cc4
1 files changed, 2 insertions, 2 deletions
diff --git a/src/libstore/build.cc b/src/libstore/build.cc
index 866964a4c..d4bd650ba 100644
--- a/src/libstore/build.cc
+++ b/src/libstore/build.cc
@@ -79,7 +79,7 @@ typedef std::shared_ptr<Goal> GoalPtr;
typedef std::weak_ptr<Goal> WeakGoalPtr;
struct CompareGoalPtrs {
- bool operator() (const GoalPtr & a, const GoalPtr & b);
+ bool operator() (const GoalPtr & a, const GoalPtr & b) const;
};
/* Set of goals. */
@@ -178,7 +178,7 @@ protected:
};
-bool CompareGoalPtrs::operator() (const GoalPtr & a, const GoalPtr & b) {
+bool CompareGoalPtrs::operator() (const GoalPtr & a, const GoalPtr & b) const {
string s1 = a->key();
string s2 = b->key();
return s1 < s2;