diff --git a/src/lib/arch/unix/ArchSystemUnix.cpp b/src/lib/arch/unix/ArchSystemUnix.cpp
index 9e554662..112e15cb 100644
--- a/src/lib/arch/unix/ArchSystemUnix.cpp
+++ b/src/lib/arch/unix/ArchSystemUnix.cpp
@@ -74,3 +74,9 @@ void
 ArchSystemUnix::setting(const std::string&, const std::string&) const
 {
 }
+
+std::string
+ArchSystemUnix::getLibsUsed(void) const
+{
+	return "not implmented.\nuse lsof on shell";
+}
diff --git a/src/lib/arch/unix/ArchSystemUnix.h b/src/lib/arch/unix/ArchSystemUnix.h
index b9f3705f..acacaa98 100644
--- a/src/lib/arch/unix/ArchSystemUnix.h
+++ b/src/lib/arch/unix/ArchSystemUnix.h
@@ -33,4 +33,6 @@ public:
 	virtual std::string getPlatformName() const;
 	virtual std::string setting(const std::string&) const;
 	virtual void setting(const std::string&, const std::string&) const;
+	virtual std::string getLibsUsed(void) const;
+
 };
diff --git a/src/lib/plugin/ns/ns.cpp b/src/lib/plugin/ns/ns.cpp
index 114023c5..fd688787 100644
--- a/src/lib/plugin/ns/ns.cpp
+++ b/src/lib/plugin/ns/ns.cpp
@@ -59,7 +59,7 @@ init(void* log, void* arch)
 		Arch::setInstance(reinterpret_cast<Arch*>(arch));
 	}
 
-	LOG(( CLOG_DEBUG "%s",helperGetLibsUsed().c_str()));
+	LOG(( CLOG_DEBUG "library use: %s",helperGetLibsUsed().c_str()));
 }
 
 int
@@ -124,4 +124,4 @@ cleanup()
 	}
 }
 
-}
\ No newline at end of file
+}