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-rw-r--r--src/libexpr/eval.hh2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/libexpr/eval.hh b/src/libexpr/eval.hh
index 1a9862c29533..d1b4fdbea627 100644
--- a/src/libexpr/eval.hh
+++ b/src/libexpr/eval.hh
@@ -6,6 +6,8 @@
 #include "nixexpr.hh"
 #include "symbol-table.hh"
 
+typedef union _ATermList * ATermList;
+
 
 namespace nix {