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-rw-r--r--src/libexpr/eval.hh1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libexpr/eval.hh b/src/libexpr/eval.hh
index f3e8a34bd..eac53b894 100644
--- a/src/libexpr/eval.hh
+++ b/src/libexpr/eval.hh
@@ -7,6 +7,7 @@
#include "hash.hh"
#include "config.hh"
+#include <regex>
#include <map>
#include <optional>
#include <unordered_map>