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-rw-r--r--src/system.hh.in1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/system.hh.in b/src/system.hh.in
index 8f501587..eaee14dc 100644
--- a/src/system.hh.in
+++ b/src/system.hh.in
@@ -156,6 +156,7 @@ typedef std::ostream::pos_type ostream_pos_type;
#include <sys/wait.h>
#endif
+#include <cstddef> /* needed for gcc 4.9 */
#include <gmp.h>
#include <mpfr.h>
#include "utf8.h"