diff --git a/AK/ByteBuffer.h b/AK/ByteBuffer.h
index 51227e0b71c..3147d90534a 100644
--- a/AK/ByteBuffer.h
+++ b/AK/ByteBuffer.h
@@ -2,9 +2,7 @@
 
 #include "Buffer.h"
 #include "Types.h"
-#include <cstdlib>
-#include <cstring>
-#include <cstdio>
+#include "StdLib.h"
 
 namespace AK {
 
@@ -17,13 +15,13 @@ public:
     {
     }
     ByteBuffer(ByteBuffer&& other)
-        : m_impl(std::move(other.m_impl))
+        : m_impl(move(other.m_impl))
     {
     }
     ByteBuffer& operator=(ByteBuffer&& other)
     {
         if (this != &other)
-            m_impl = std::move(other.m_impl);
+            m_impl = move(other.m_impl);
         return *this;
     }
 
@@ -73,7 +71,7 @@ public:
 
 private:
     explicit ByteBuffer(RetainPtr<Buffer<byte>>&& impl)
-        : m_impl(std::move(impl))
+        : m_impl(move(impl))
     {
     }
 
diff --git a/AK/RetainPtr.h b/AK/RetainPtr.h
index f4af4d860ba..5bc6ba62873 100644
--- a/AK/RetainPtr.h
+++ b/AK/RetainPtr.h
@@ -1,7 +1,8 @@
 #pragma once
 
-#include <cstddef>
-#include <utility>
+namespace std {
+typedef decltype(nullptr) nullptr_t;
+}
 
 namespace AK {
 
diff --git a/AK/StdLib.h b/AK/StdLib.h
index c23609451e1..5c70559087a 100644
--- a/AK/StdLib.h
+++ b/AK/StdLib.h
@@ -24,6 +24,11 @@ static inline T ceilDiv(T a, T b)
     return result;
 }
 
+template <typename T>
+T&& move(T& arg)
+{
+    return static_cast<T&&>(arg);
+}
 
 }
 
diff --git a/AK/StringImpl.cpp b/AK/StringImpl.cpp
index 0d7016973ae..6276c20a0e8 100644
--- a/AK/StringImpl.cpp
+++ b/AK/StringImpl.cpp
@@ -17,12 +17,12 @@ StringImpl::~StringImpl()
 {
 }
 
-static inline size_t allocationSizeForStringImpl(unsigned length)
+static inline size_t allocationSizeForStringImpl(size_t length)
 {
     return sizeof(StringImpl) + (sizeof(char) * length) + sizeof(char);
 }
 
-RetainPtr<StringImpl> StringImpl::createUninitialized(unsigned length, char*& buffer)
+RetainPtr<StringImpl> StringImpl::createUninitialized(size_t length, char*& buffer)
 {
     if (!length)
         return theEmptyStringImpl();
@@ -89,7 +89,7 @@ RetainPtr<StringImpl> StringImpl::toLowercase() const
     if (!m_length)
         return const_cast<StringImpl*>(this);
 
-    for (unsigned i = 0; i < m_length; ++i) {
+    for (size_t i = 0; i < m_length; ++i) {
         if (!isASCIILowercase(m_characters[i]))
             goto slowPath;
     }
@@ -98,9 +98,8 @@ RetainPtr<StringImpl> StringImpl::toLowercase() const
 slowPath:
     char* buffer;
     auto lowercased = createUninitialized(m_length, buffer);
-    for (unsigned i = 0; i < m_length; ++i) {
+    for (size_t i = 0; i < m_length; ++i)
         buffer[i] = toASCIILowercase(m_characters[i]);
-    }
 
     return lowercased;
 }
@@ -110,7 +109,7 @@ RetainPtr<StringImpl> StringImpl::toUppercase() const
     if (!m_length)
         return const_cast<StringImpl*>(this);
 
-    for (unsigned i = 0; i < m_length; ++i) {
+    for (size_t i = 0; i < m_length; ++i) {
         if (!isASCIIUppercase(m_characters[i]))
             goto slowPath;
     }
@@ -119,9 +118,8 @@ RetainPtr<StringImpl> StringImpl::toUppercase() const
 slowPath:
     char* buffer;
     auto uppercased = createUninitialized(m_length, buffer);
-    for (unsigned i = 0; i < m_length; ++i) {
+    for (size_t i = 0; i < m_length; ++i)
         buffer[i] = toASCIIUppercase(m_characters[i]);
-    }
 
     return uppercased;
 }
@@ -132,7 +130,7 @@ void StringImpl::computeHash() const
         m_hash = 0;
     } else {
         unsigned hash = 0;
-        for (unsigned i = 0; i < m_length; ++i) {
+        for (size_t i = 0; i < m_length; ++i) {
             hash += m_characters[i];
             hash += (hash << 10);
             hash ^= (hash >> 6);
diff --git a/AK/StringImpl.h b/AK/StringImpl.h
index 64c4f87415b..2278438f6cb 100644
--- a/AK/StringImpl.h
+++ b/AK/StringImpl.h
@@ -2,12 +2,13 @@
 
 #include "Retainable.h"
 #include "RetainPtr.h"
+#include "Types.h"
 
 namespace AK {
 
 class StringImpl : public Retainable<StringImpl> {
 public:
-    static RetainPtr<StringImpl> createUninitialized(unsigned length, char*& buffer);
+    static RetainPtr<StringImpl> createUninitialized(size_t length, char*& buffer);
     static RetainPtr<StringImpl> create(const char* cstring);
     static RetainPtr<StringImpl> create(const char* cstring, size_t length);
     RetainPtr<StringImpl> toLowercase() const;
@@ -17,9 +18,9 @@ public:
 
     ~StringImpl();
 
-    unsigned length() const { return m_length; }
+    size_t length() const { return m_length; }
     const char* characters() const { return m_characters; }
-    char operator[](unsigned i) const { ASSERT(i < m_length); return m_characters[i]; }
+    char operator[](size_t i) const { ASSERT(i < m_length); return m_characters[i]; }
 
     unsigned hash() const
     {
@@ -33,11 +34,11 @@ private:
     explicit StringImpl(ConstructTheEmptyStringImplTag) : m_characters("") { }
 
     enum ConstructWithInlineBufferTag { ConstructWithInlineBuffer };
-    explicit StringImpl(ConstructWithInlineBufferTag, unsigned length) : m_length(length), m_characters(m_inlineBuffer) { }
+    explicit StringImpl(ConstructWithInlineBufferTag, size_t length) : m_length(length), m_characters(m_inlineBuffer) { }
 
     void computeHash() const;
 
-    unsigned m_length { 0 };
+    size_t m_length { 0 };
     bool m_ownsBuffer { true };
     mutable bool m_hasHash { false };
     const char* m_characters { nullptr };
diff --git a/AK/Types.h b/AK/Types.h
index cd0eee2ff46..f970c128481 100644
--- a/AK/Types.h
+++ b/AK/Types.h
@@ -1,6 +1,10 @@
 #pragma once
 
+#ifdef SERENITY_KERNEL
+#else
 #include <stdint.h>
+#include <sys/types.h>
+#endif
 
 typedef uint8_t byte;
 typedef uint16_t word;
@@ -15,3 +19,8 @@ typedef int64_t signed_qword;
 constexpr unsigned KB = 1024;
 constexpr unsigned MB = KB * KB;
 constexpr unsigned GB = KB * KB * KB;
+
+namespace std {
+typedef decltype(nullptr) nullptr_t;
+}
+
diff --git a/AK/Vector.h b/AK/Vector.h
index 88ed35ac198..3bf78213675 100644
--- a/AK/Vector.h
+++ b/AK/Vector.h
@@ -4,9 +4,6 @@
 #include "OwnPtr.h"
 #include "kmalloc.h"
 #include <new>
-#include <stdlib.h>
-#include <stdio.h>
-#include <algorithm>
 
 namespace AK {
 
@@ -34,7 +31,7 @@ public:
         ASSERT(index < m_size);
         at(index).~T();
         for (unsigned i = index + 1; i < m_size; ++i) {
-            new (slot(i - 1)) T(std::move(at(i)));
+            new (slot(i - 1)) T(move(at(i)));
             at(i).~T();
         }
 
@@ -63,14 +60,14 @@ public:
     ~Vector() { clear(); }
 
     Vector(Vector&& other)
-        : m_impl(std::move(other.m_impl))
+        : m_impl(move(other.m_impl))
     {
     }
 
     Vector& operator=(Vector&& other)
     {
         if (this != &other)
-            m_impl = std::move(other.m_impl);
+            m_impl = move(other.m_impl);
         return *this;
     }
 
@@ -101,7 +98,7 @@ public:
     T takeLast()
     {
         ASSERT(!isEmpty());
-        T value = std::move(last());
+        T value = move(last());
         last().~T();
         --m_impl->m_size;
         return value;
@@ -115,7 +112,7 @@ public:
     void append(T&& value)
     {
         ensureCapacity(size() + 1);
-        new (m_impl->slot(m_impl->m_size)) T(std::move(value));
+        new (m_impl->slot(m_impl->m_size)) T(move(value));
         ++m_impl->m_size;
     }
 
@@ -135,11 +132,11 @@ public:
         if (m_impl) {
             newImpl->m_size = m_impl->m_size;
             for (unsigned i = 0; i < size(); ++i) {
-                new (newImpl->slot(i)) T(std::move(m_impl->at(i)));
+                new (newImpl->slot(i)) T(move(m_impl->at(i)));
                 m_impl->at(i).~T();
             }
         }
-        m_impl = std::move(newImpl);
+        m_impl = move(newImpl);
     }
 
     class Iterator {
@@ -175,7 +172,7 @@ public:
 private:
     static unsigned paddedCapacity(unsigned capacity)
     {
-        return std::max(4u, capacity + (capacity / 4) + 4);
+        return max(4u, capacity + (capacity / 4) + 4);
     }
 
     OwnPtr<VectorImpl<T>> m_impl;
diff --git a/AK/test.cpp b/AK/test.cpp
index edf3c4b34df..92838cbc290 100644
--- a/AK/test.cpp
+++ b/AK/test.cpp
@@ -20,7 +20,12 @@ int main(int, char**)
         for (auto& part : parts)
             printf("<%s>\n", part.characters());
     }
-
+    {
+        String cmd = "cd";
+        auto parts = cmd.split(' ');
+        for (auto& part : parts)
+            printf("<%s>\n", part.characters());
+    }
 
     String empty = "";