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-rw-r--r--src/utils/sexpr.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/utils/sexpr.cc b/src/utils/sexpr.cc
index 69dc7b72..9e57765f 100644
--- a/src/utils/sexpr.cc
+++ b/src/utils/sexpr.cc
@@ -32,6 +32,7 @@
// --% Author: Gabriel Dos Reis.
#include <ctype.h>
+#include <string.h>
#include <iostream>
#include <iterator>
#include <open-axiom/sexpr>