--- libpretrace-0.4.orig/libpretrace.c	2008-06-18 11:31:33.000000000 -0400
+++ libpretrace-0.4.orig/libpretrace.c	2008-06-18 11:36:32.000000000 -0400
@@ -18,6 +18,14 @@ 
 #include <sys/stat.h>
 #include <unistd.h>
 
+#if defined(_SC_ARG_MAX)
+# if defined(ARG_MAX)
+#   undef ARG_MX
+# endif
+#define ARG_MAX sysconf(_SC_ARG_MAX)
+#endif
+
+
 /* #define DEBUG */
 
 #include "trie.h"
--- libpretrace-0.4.orig/ptgenmap.c	2008-06-18 11:31:33.000000000 -0400
+++ libpretrace-0.4.orig/ptgenmap.c	2008-06-18 11:37:02.000000000 -0400
@@ -2,6 +2,14 @@ 
 #include <limits.h>
 #include <string.h>
 #include <stdlib.h>
+#include <unistd.h>
+
+#if defined(_SC_ARG_MAX)
+# if defined(ARG_MAX)
+#   undef ARG_MX
+# endif
+#define ARG_MAX sysconf(_SC_ARG_MAX)
+#endif
 
 #include "pretrace.h"
 #include "trie.h"