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-rw-r--r--src/libstore/normalise.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libstore/normalise.cc b/src/libstore/normalise.cc
index 682ea2a80e6a..d91e5ea268ae 100644
--- a/src/libstore/normalise.cc
+++ b/src/libstore/normalise.cc
@@ -7,6 +7,7 @@
 #include <sys/stat.h>
 #include <fcntl.h>
 #include <unistd.h>
+#include <errno.h>
 
 #include "normalise.hh"
 #include "references.hh"