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-rw-r--r--src/nix-env/main.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/nix-env/main.cc b/src/nix-env/main.cc
index 267e478f4a9c..84c89a157ae1 100644
--- a/src/nix-env/main.cc
+++ b/src/nix-env/main.cc
@@ -13,6 +13,7 @@
 #include <cerrno>
 #include <ctime>
 #include <algorithm>
+#include <iostream>
 
 #include <unistd.h>