diff --git a/LibC/Makefile b/LibC/Makefile
index 15f5b33b7a..88ab201b63 100644
--- a/LibC/Makefile
+++ b/LibC/Makefile
@@ -23,7 +23,7 @@ OBJS = $(AK_OBJS) $(LIBC_OBJS)
 
 LIBRARY = LibC.a
 ARCH_FLAGS =
-STANDARD_FLAGS = -std=c++17 -nostdinc++ -nostdlib
+STANDARD_FLAGS = -std=c++17 -nostdinc++ -nostdlib -nostdinc
 LIBC_FLAGS = -ffreestanding -fno-stack-protector -fno-ident
 WARNING_FLAGS = -Wextra -Wall -Wundef -Wcast-qual -Wwrite-strings
 FLAVOR_FLAGS = -fomit-frame-pointer -mregparm=3 -march=i386 -m32 -fno-exceptions -fno-rtti -ffunction-sections -fdata-sections -fmerge-all-constants -fno-unroll-loops -falign-functions=1 -falign-jumps=1 -falign-loops=1 -fno-pie -fno-pic
diff --git a/LibC/assert.h b/LibC/assert.h
index 1f5610dd2e..b56bd14d79 100644
--- a/LibC/assert.h
+++ b/LibC/assert.h
@@ -1,6 +1,8 @@
 #pragma once
 
-extern "C" {
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
 
 void __assertion_failed(const char* msg, const char* file, unsigned line, const char* func);
 
@@ -10,5 +12,5 @@ void __assertion_failed(const char* msg, const char* file, unsigned line, const
 #define RELEASE_ASSERT assert
 #define ASSERT_NOT_REACHED() assert(false)
 
-}
+__END_DECLS
 
diff --git a/LibC/ctype.h b/LibC/ctype.h
new file mode 100644
index 0000000000..a69bbfdea9
--- /dev/null
+++ b/LibC/ctype.h
@@ -0,0 +1,4 @@
+#pragma once
+
+#define isascii(c)    (((c) & ~0x7f) == 0)
+
diff --git a/LibC/dirent.h b/LibC/dirent.h
index be069d8133..f8a832ae79 100644
--- a/LibC/dirent.h
+++ b/LibC/dirent.h
@@ -1,8 +1,9 @@
 #pragma once
 
-#include "types.h"
+#include <sys/cdefs.h>
+#include <sys/types.h>
 
-extern "C" {
+__BEGIN_DECLS
 
 struct dirent {
     ino_t d_ino;
@@ -23,5 +24,5 @@ struct DIR {
 DIR* opendir(const char* name);
 dirent* readdir(DIR* dirp);
 
-}
+__END_DECLS
 
diff --git a/LibC/entry.cpp b/LibC/entry.cpp
index c3657b704b..e4ea51f9bd 100644
--- a/LibC/entry.cpp
+++ b/LibC/entry.cpp
@@ -1,14 +1,29 @@
+#include <stdio.h>
 #include <Kernel/Syscall.h>
 #include <AK/StringImpl.h>
 
 extern "C" int main(int, char**);
 
+FILE __default_streams[3];
+
 int errno;
+FILE* stdin;
+FILE* stdout;
+FILE* stderr;
 
 extern "C" int _start()
 {
     errno = 0;
 
+    __default_streams[0].fd = 0;
+    stdin = &__default_streams[0];
+
+    __default_streams[1].fd = 1;
+    stdout = &__default_streams[1];
+
+    __default_streams[2].fd = 2;
+    stderr = &__default_streams[2];
+
     StringImpl::initializeGlobals();
 
     int argc;
diff --git a/LibC/errno.h b/LibC/errno.h
index c28cb71f24..235a9b383f 100644
--- a/LibC/errno.h
+++ b/LibC/errno.h
@@ -1,5 +1,6 @@
 #pragma once
 
+#include <sys/cdefs.h>
 #include <Kernel/errno.h>
 
 #define __RETURN_WITH_ERRNO(rc, good_ret, bad_ret) \
@@ -13,9 +14,9 @@
         } \
     } while(0)
 
-extern "C" {
+__BEGIN_DECLS
 
 extern int errno;
 
-};
+__END_DECLS
 
diff --git a/LibC/fcntl.h b/LibC/fcntl.h
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/LibC/mman.h b/LibC/mman.h
index 5c82eef3ef..b587934043 100644
--- a/LibC/mman.h
+++ b/LibC/mman.h
@@ -1,11 +1,13 @@
 #pragma once
 
-#include "types.h"
+#include <sys/cdefs.h>
+#include <sys/types.h>
 
-extern "C" {
+__BEGIN_DECLS
 
 void* mmap(void*, size_t);
 int munmap(void*, size_t);
 int set_mmap_name(void*, size_t, const char*);
 
-}
+__END_DECLS
+
diff --git a/LibC/process.h b/LibC/process.h
index 235415469a..9b5bf828a9 100644
--- a/LibC/process.h
+++ b/LibC/process.h
@@ -1,8 +1,10 @@
 #pragma once
 
-extern "C" {
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
 
 int spawn(const char* path, const char** args);
 
-}
+__END_DECLS
 
diff --git a/LibC/signal.h b/LibC/signal.h
index 6a138098b6..73e7eeaa43 100644
--- a/LibC/signal.h
+++ b/LibC/signal.h
@@ -1,8 +1,8 @@
 #pragma once
 
-#include "types.h"
+#include <sys/types.h>
 
-extern "C" {
+__BEGIN_DECLS
 
 int kill(pid_t, int sig);
 
@@ -22,5 +22,5 @@ int kill(pid_t, int sig);
 #define SIGALRM  14
 #define SIGTERM  15
 
-}
+__END_DECLS
 
diff --git a/LibC/stdarg.h b/LibC/stdarg.h
index cf3d55977b..724ffb59d5 100644
--- a/LibC/stdarg.h
+++ b/LibC/stdarg.h
@@ -1,6 +1,8 @@
 #pragma once
 
-extern "C" {
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
 
 typedef char* va_list;
 
@@ -8,5 +10,5 @@ typedef char* va_list;
 #define va_arg(ap, t) ((t*)(ap += sizeof(t)))[-1]
 #define va_end(ap) ap = nullptr
 
-}
+__END_DECLS
 
diff --git a/LibC/stdio.cpp b/LibC/stdio.cpp
index e5488742db..af36176079 100644
--- a/LibC/stdio.cpp
+++ b/LibC/stdio.cpp
@@ -1,9 +1,9 @@
-#include "stdio.h"
-#include "stdarg.h"
-#include "types.h"
-#include "string.h"
-#include "errno.h"
-#include "unistd.h"
+#include <stdio.h>
+#include <stdarg.h>
+#include <sys/types.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
 #include <Kernel/Syscall.h>
 #include <AK/printf.cpp>
 
diff --git a/LibC/stdio.h b/LibC/stdio.h
index 1e6a79ea71..6129ccd3da 100644
--- a/LibC/stdio.h
+++ b/LibC/stdio.h
@@ -1,11 +1,28 @@
 #pragma once
 
-extern "C" {
+#include <sys/cdefs.h>
 
+__BEGIN_DECLS
+
+#ifndef EOF
+#define EOF (-1)
+#endif
+
+struct __STDIO_FILE {
+    int fd;
+};
+
+typedef struct __STDIO_FILE FILE;
+
+extern FILE* stdin;
+extern FILE* stdout;
+extern FILE* stderr;
+
+int fprintf(FILE*, const char* fmt, ...);
 int printf(const char* fmt, ...);
 int sprintf(char* buffer, const char* fmt, ...);
 int putchar(int ch);
 void perror(const char*);
 
-}
+__END_DECLS
 
diff --git a/LibC/stdlib.h b/LibC/stdlib.h
index 4ebff011da..0f88c6edf4 100644
--- a/LibC/stdlib.h
+++ b/LibC/stdlib.h
@@ -1,8 +1,9 @@
 #pragma once
 
-#include "types.h"
+#include <sys/cdefs.h>
+#include <sys/types.h>
 
-extern "C" {
+__BEGIN_DECLS
 
 void* malloc(size_t);
 void free(void*);
@@ -12,5 +13,5 @@ void* realloc(void *ptr, size_t);
 void exit(int status);
 void abort();
 
-}
+__END_DECLS
 
diff --git a/LibC/string.h b/LibC/string.h
index 6ef56e075b..42e3678293 100644
--- a/LibC/string.h
+++ b/LibC/string.h
@@ -1,8 +1,9 @@
 #pragma once
 
-#include "types.h"
+#include <sys/cdefs.h>
+#include <sys/types.h>
 
-extern "C" {
+__BEGIN_DECLS
 
 size_t strlen(const char*);
 int strcmp(const char*, const char*);
@@ -10,5 +11,5 @@ int memcmp(const void*, const void*, size_t);
 void memcpy(void*, const void*, size_t);
 const char* strerror(int errnum);
 
-}
+__END_DECLS
 
diff --git a/LibC/sys/cdefs.h b/LibC/sys/cdefs.h
new file mode 100644
index 0000000000..c2285b88a8
--- /dev/null
+++ b/LibC/sys/cdefs.h
@@ -0,0 +1,10 @@
+#pragma once
+
+#ifdef __cplusplus
+#define __BEGIN_DECLS extern "C" {
+#define __END_DECLS }
+#else
+#define __BEGIN_DECLS
+#define __END_DECLS
+#endif
+
diff --git a/LibC/sys/ioctl.h b/LibC/sys/ioctl.h
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/LibC/sys/stat.h b/LibC/sys/stat.h
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/LibC/types.h b/LibC/sys/types.h
similarity index 91%
rename from LibC/types.h
rename to LibC/sys/types.h
index d8aacd8728..919e419954 100644
--- a/LibC/types.h
+++ b/LibC/sys/types.h
@@ -1,6 +1,8 @@
 #pragma once
 
-extern "C" {
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
 
 typedef unsigned int dword;
 typedef unsigned short word;
@@ -49,5 +51,11 @@ struct stat {
     time_t    st_ctime;   /* time of last status change */
 };
 
-}
+#ifdef __cplusplus
+#define NULL nullptr
+#else
+#define NULL 0
+#endif
+
+__END_DECLS
 
diff --git a/LibC/time.h b/LibC/time.h
index acce4816bd..dd1e20cf2d 100644
--- a/LibC/time.h
+++ b/LibC/time.h
@@ -1,11 +1,12 @@
 #pragma once
 
-#include "types.h"
+#include <sys/cdefs.h>
+#include <sys/types.h>
 
-extern "C" {
+__BEGIN_DECLS
 
 int gettimeofday(timeval*);
 time_t time(time_t*);
 
-}
+__END_DECLS
 
diff --git a/LibC/unistd.h b/LibC/unistd.h
index 25ac8e0586..b0397c6aa9 100644
--- a/LibC/unistd.h
+++ b/LibC/unistd.h
@@ -1,8 +1,9 @@
 #pragma once
 
-#include "types.h"
+#include <sys/cdefs.h>
+#include <sys/types.h>
 
-extern "C" {
+__BEGIN_DECLS
 
 uid_t getuid();
 gid_t getgid();
@@ -14,7 +15,7 @@ int close(int fd);
 pid_t waitpid(pid_t, int* wstatus, int options);
 int chdir(const char* path);
 char* getcwd(char* buffer, size_t size);
-int lstat(const char* path, stat* statbuf);
+int lstat(const char* path, struct stat* statbuf);
 int sleep(unsigned seconds);
 int gethostname(char*, size_t);
 ssize_t readlink(const char* path, char* buffer, size_t);
@@ -62,4 +63,5 @@ int ttyname_r(int fd, char* buffer, size_t);
 #define O_DIRECTORY 00200000
 #define O_NOFOLLOW 00400000
 
-}
+__END_DECLS
+
diff --git a/LibC/utsname.h b/LibC/utsname.h
index d50a5a4270..e617b2e34d 100644
--- a/LibC/utsname.h
+++ b/LibC/utsname.h
@@ -1,8 +1,10 @@
 #pragma once
 
+#include <sys/cdefs.h>
+
 #define UTSNAME_ENTRY_LEN 65
 
-extern "C" {
+__BEGIN_DECLS
 
 struct utsname {
     char sysname[UTSNAME_ENTRY_LEN];
@@ -14,4 +16,5 @@ struct utsname {
 
 int uname(struct utsname*);
 
-}
+__END_DECLS
+
diff --git a/Userland/Makefile b/Userland/Makefile
index 08ee253c74..21b0b9ff91 100644
--- a/Userland/Makefile
+++ b/Userland/Makefile
@@ -35,12 +35,12 @@ APPS = \
        kill
 
 ARCH_FLAGS =
-STANDARD_FLAGS = -std=c++17 -nostdinc++ -nostdlib
+STANDARD_FLAGS = -std=c++17 -nostdinc++ -nostdlib -nostdinc
 USERLAND_FLAGS = -ffreestanding -fno-stack-protector -fno-ident
 WARNING_FLAGS = -Wextra -Wall -Wundef -Wcast-qual -Wwrite-strings
 FLAVOR_FLAGS = -march=i386 -mregparm=3 -m32 -fno-exceptions -fno-rtti -fmerge-all-constants -fno-unroll-loops -fno-pie -fno-pic
 OPTIMIZATION_FLAGS = -Os -fno-asynchronous-unwind-tables
-INCLUDE_FLAGS = -I.. -I.
+INCLUDE_FLAGS = -I.. -I. -I../LibC
 
 DEFINES = -DSERENITY -DSANITIZE_PTRS -DUSERLAND