diff --git a/app/Main.cc b/app/Main.cc
index 26553d69..ea43d73f 100644
--- a/app/Main.cc
+++ b/app/Main.cc
@@ -17,6 +17,7 @@
 #include "StaMain.hh"
 
 #include <stdio.h>
+#include <cstdlib>              // exit
 #include <tcl.h>
 
 #include "StaConfig.hh"  // STA_VERSION
diff --git a/search/Power.cc b/search/Power.cc
index f20c3b9e..d52dc845 100644
--- a/search/Power.cc
+++ b/search/Power.cc
@@ -17,6 +17,7 @@
 #include "Power.hh"
 
 #include <algorithm> // max
+#include <cmath>     // aps
 
 #include "Debug.hh"
 #include "EnumNameMap.hh"
@@ -60,6 +61,8 @@
 
 namespace sta {
 
+using std::abs;
+
 static bool
 isPositiveUnate(const LibertyCell *cell,
 		const LibertyPort *from,
diff --git a/util/Report.cc b/util/Report.cc
index 76ab4b4c..2139dd82 100644
--- a/util/Report.cc
+++ b/util/Report.cc
@@ -17,6 +17,7 @@
 #include "Report.hh"
 
 #include <algorithm> // min
+#include <cstdlib>   // exit
 
 #include "Error.hh"