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-rw-r--r--src/libexpr/lexer.l1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libexpr/lexer.l b/src/libexpr/lexer.l
index 625e044b682f..5db13a71699b 100644
--- a/src/libexpr/lexer.l
+++ b/src/libexpr/lexer.l
@@ -10,6 +10,7 @@
 #include "aterm.hh"
 #include "nixexpr.hh"
 #include "nixexpr-ast.hh"
+#define BISON_HEADER_HACK
 #include "parser-tab.hh"
 
 using namespace nix;