diff -up asymptote-1.37/pipestream.h.BAD asymptote-1.37/pipestream.h
--- asymptote-1.37/pipestream.h.BAD 2008-01-03 13:32:42.000000000 -0500
+++ asymptote-1.37/pipestream.h 2008-01-03 13:32:52.000000000 -0500
@@ -20,6 +20,7 @@
#define PIPESTREAM_H
#include <iostream>
+#include <cstring>
#include <sys/wait.h>
#include <cerrno>
#include <sstream>