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>