--- a/src/gtkcompletionline.cc
+++ b/src/gtkcompletionline.cc
@@ -29,6 +29,7 @@
 #include <set>
 #include <sstream>
 #include <string>
+#include <cstring>
 #include <vector>
 using namespace std;
 
--- a/src/ci_string.h
+++ b/src/ci_string.h
@@ -7,6 +7,7 @@
 #define __CI_STRING_H__
 
 #include <string>
+#include <cstring>
 #include <ctype.h>
 
 struct ci_char_traits : public std::char_traits<char>
--- a/src/prefs.cc
+++ b/src/prefs.cc
@@ -13,6 +13,7 @@
 #include <fstream>
 #include <iostream>
 #include <stdio.h>
+#include <stdlib.h>
 
 #include <list>
 
--- a/src/main.cc
+++ b/src/main.cc
@@ -14,6 +14,7 @@
 #include <gdk/gdkkeysyms.h>
 
 #include <string>
+#include <cstring>
 #include <iostream>
 #include <sstream>
 #include <vector>