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-rw-r--r--passes/hierarchy/hierarchy.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/passes/hierarchy/hierarchy.cc b/passes/hierarchy/hierarchy.cc
index f77ded9d..01e287e9 100644
--- a/passes/hierarchy/hierarchy.cc
+++ b/passes/hierarchy/hierarchy.cc
@@ -23,6 +23,7 @@
#include <stdio.h>
#include <fnmatch.h>
#include <set>
+#include <unistd.h>
namespace {
struct generate_port_decl_t {