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-rw-r--r--src/libexpr/nixexpr.cc2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/libexpr/nixexpr.cc b/src/libexpr/nixexpr.cc
index 1eeec2cf19f7..0f5ec030654f 100644
--- a/src/libexpr/nixexpr.cc
+++ b/src/libexpr/nixexpr.cc
@@ -6,6 +6,8 @@
 #include "nixexpr-ast.hh"
 #include "nixexpr-ast.cc"
 
+#include <cstdlib>
+
 
 namespace nix {