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-rw-r--r--src/libutil/util.hh2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/libutil/util.hh b/src/libutil/util.hh
index 2d75a7a506aa..e5ce55341881 100644
--- a/src/libutil/util.hh
+++ b/src/libutil/util.hh
@@ -8,6 +8,8 @@
 #include <unistd.h>
 #include <signal.h>
 
+#include <iostream>
+
 
 namespace nix {