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-rw-r--r--nix/libstore/optimise-store.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/nix/libstore/optimise-store.cc b/nix/libstore/optimise-store.cc
index 8ba9d1a263..c62b8e451b 100644
--- a/nix/libstore/optimise-store.cc
+++ b/nix/libstore/optimise-store.cc
@@ -4,6 +4,7 @@
 #include "local-store.hh"
 #include "globals.hh"
 
+#include <cstdlib>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <unistd.h>