diff --git a/vlsisapd/src/bookshelf/src/Exception.cpp b/vlsisapd/src/bookshelf/src/Exception.cpp
index 5125fcde..a6652417 100644
--- a/vlsisapd/src/bookshelf/src/Exception.cpp
+++ b/vlsisapd/src/bookshelf/src/Exception.cpp
@@ -24,6 +24,7 @@
 
 
 #include  <cstdarg>
+#include  <cstdio>
 #include  "vlsisapd/bookshelf/Exception.h"
 
 
diff --git a/vlsisapd/src/liberty/src/Cell.cpp b/vlsisapd/src/liberty/src/Cell.cpp
index 8c38e561..6727254d 100644
--- a/vlsisapd/src/liberty/src/Cell.cpp
+++ b/vlsisapd/src/liberty/src/Cell.cpp
@@ -1,3 +1,5 @@
+#include<cstdlib>
+
 #include<iostream>
 #include<fstream>
 #include<sstream>
diff --git a/vlsisapd/src/liberty/src/FlipFlop.cpp b/vlsisapd/src/liberty/src/FlipFlop.cpp
index 68c5bfbd..0a10b254 100644
--- a/vlsisapd/src/liberty/src/FlipFlop.cpp
+++ b/vlsisapd/src/liberty/src/FlipFlop.cpp
@@ -1,3 +1,5 @@
+#include<cstdlib>
+
 #include<iostream>
 #include<fstream>
 #include<sstream>
diff --git a/vlsisapd/src/liberty/src/Library.cpp b/vlsisapd/src/liberty/src/Library.cpp
index 4bb53916..05dde80b 100644
--- a/vlsisapd/src/liberty/src/Library.cpp
+++ b/vlsisapd/src/liberty/src/Library.cpp
@@ -1,3 +1,5 @@
+#include<cstdlib>
+
 #include<iostream>
 #include<fstream>
 #include<sstream>
diff --git a/vlsisapd/src/liberty/src/Pin.cpp b/vlsisapd/src/liberty/src/Pin.cpp
index 8c213063..68fd65ca 100644
--- a/vlsisapd/src/liberty/src/Pin.cpp
+++ b/vlsisapd/src/liberty/src/Pin.cpp
@@ -1,3 +1,5 @@
+#include<cstdlib>
+
 #include<iostream>
 #include<fstream>
 #include<sstream>
diff --git a/vlsisapd/src/liberty/src/Timing.cpp b/vlsisapd/src/liberty/src/Timing.cpp
index 56ca9418..77293155 100644
--- a/vlsisapd/src/liberty/src/Timing.cpp
+++ b/vlsisapd/src/liberty/src/Timing.cpp
@@ -1,3 +1,5 @@
+#include<cstdlib>
+
 #include<iostream>
 #include<fstream>
 #include<sstream>
diff --git a/vlsisapd/src/liberty/src/WireLoad.cpp b/vlsisapd/src/liberty/src/WireLoad.cpp
index d6b7ca52..0c22f6a2 100644
--- a/vlsisapd/src/liberty/src/WireLoad.cpp
+++ b/vlsisapd/src/liberty/src/WireLoad.cpp
@@ -1,3 +1,5 @@
+#include<cstdlib>
+
 #include<iostream>
 #include<fstream>
 #include<sstream>