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-rw-r--r--src/libstore/store-api.cc6
1 files changed, 6 insertions, 0 deletions
diff --git a/src/libstore/store-api.cc b/src/libstore/store-api.cc
index 23631a3b8..ced5fd007 100644
--- a/src/libstore/store-api.cc
+++ b/src/libstore/store-api.cc
@@ -5,6 +5,12 @@
#include <limits.h>
+/* Needed for some ancient environments. */
+#ifndef ULLONG_MAX
+#define ULLONG_MAX 18446744073709551615
+#endif
+
+
namespace nix {