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-rw-r--r--src/libstore/pathlocks.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libstore/pathlocks.cc b/src/libstore/pathlocks.cc
index b6d8547c70e6..2635e3940af8 100644
--- a/src/libstore/pathlocks.cc
+++ b/src/libstore/pathlocks.cc
@@ -5,6 +5,7 @@
 #include <cerrno>
 #include <cstdlib>
 
+#include <fcntl.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <sys/file.h>