--- src/parsegen.cpp
+++ src/parsegen.cpp
@@ -31,6 +31,7 @@
 #include <sstream>
 #include <set>
 #include <stack>
+#include <cstring>
 using namespace std;
 
 #include <errno.h>
--- src/tools/depbuild.cpp
+++ src/tools/depbuild.cpp
@@ -24,6 +24,7 @@
 #include <iostream>
 #include <string>
 #include <cstdio>
+#include <cstdlib>
 using namespace std;
 
 #include "fileutil.h"
@@ -183,7 +184,7 @@
   }
 }
 
-int main(size_t argc, const char *const *const argv)
+int main(int argc, const char *const *const argv)
 {
   if (argc < 5)
   {
--- src/tools/strutil.h
+++ src/tools/strutil.h
@@ -25,6 +25,7 @@
 #include <string>
 #include <vector>
 #include <cctype>
+#include <cstring>
 
 struct ci_char_traits : public std::char_traits<char>
 {