diff --git a/Library/errno.cpp b/Library/errno.cpp
new file mode 100644
index 0000000..9eea55b
--- /dev/null
+++ b/Library/errno.cpp
@@ -0,0 +1,10 @@
+#include <errno.h>
+
+#include <types.h>
+#include <debug.h>
+
+int *__errno_location(void)
+{
+    fixme("errno_location() is not implemented yet!");
+    return nullptr;
+}
diff --git a/include/assert.h b/include/assert.h
index 03c8482..8664a22 100644
--- a/include/assert.h
+++ b/include/assert.h
@@ -1,8 +1,6 @@
 #ifndef __FENNIX_KERNEL_ASSERT_H__
 #define __FENNIX_KERNEL_ASSERT_H__
 
-#include <types.h>
-
 #include <debug.h>
 
 #define assert(x)                                                                                                    \
diff --git a/include/errno.h b/include/errno.h
new file mode 100644
index 0000000..bee1450
--- /dev/null
+++ b/include/errno.h
@@ -0,0 +1,42 @@
+#ifndef _ERRNO_H
+#define _ERRNO_H
+
+#define EPERM 1    /* Operation not permitted */
+#define ENOENT 2   /* No such file or directory */
+#define ESRCH 3    /* No such process */
+#define EINTR 4    /* Interrupted system call */
+#define EIO 5      /* I/O error */
+#define ENXIO 6    /* No such device or address */
+#define E2BIG 7    /* Argument list too long */
+#define ENOEXEC 8  /* Exec format error */
+#define EBADF 9    /* Bad file number */
+#define ECHILD 10  /* No child processes */
+#define EAGAIN 11  /* Try again */
+#define ENOMEM 12  /* Out of memory */
+#define EACCES 13  /* Permission denied */
+#define EFAULT 14  /* Bad address */
+#define ENOTBLK 15 /* Block device required */
+#define EBUSY 16   /* Device or resource busy */
+#define EEXIST 17  /* File exists */
+#define EXDEV 18   /* Cross-device link */
+#define ENODEV 19  /* No such device */
+#define ENOTDIR 20 /* Not a directory */
+#define EISDIR 21  /* Is a directory */
+#define EINVAL 22  /* Invalid argument */
+#define ENFILE 23  /* File table overflow */
+#define EMFILE 24  /* Too many open files */
+#define ENOTTY 25  /* Not a typewriter */
+#define ETXTBSY 26 /* Text file busy */
+#define EFBIG 27   /* File too large */
+#define ENOSPC 28  /* No space left on device */
+#define ESPIPE 29  /* Illegal seek */
+#define EROFS 30   /* Read-only file system */
+#define EMLINK 31  /* Too many links */
+#define EPIPE 32   /* Broken pipe */
+#define EDOM 33    /* Math argument out of domain of func */
+#define ERANGE 34  /* Math result not representable */
+
+extern int *__errno_location(void) __attribute__((const));
+#define errno (*__errno_location())
+
+#endif // !_ERRNO_H
diff --git a/include/math.h b/include/math.h
new file mode 100644
index 0000000..06529a8
--- /dev/null
+++ b/include/math.h
@@ -0,0 +1,4 @@
+#ifndef _MATH_H
+#define _MATH_H
+
+#endif // !_MATH_H
diff --git a/include/stdint.h b/include/stdint.h
index 2c4931e..34e75da 100644
--- a/include/stdint.h
+++ b/include/stdint.h
@@ -1,6 +1,4 @@
-#ifndef __FENNIX_KERNEL_STUB_STDINT_H__
-#define __FENNIX_KERNEL_STUB_STDINT_H__
+#ifndef _STDINT_H
+#define _STDINT_H
 
-#include <types.h>
-
-#endif // !__FENNIX_KERNEL_STUB_STDINT_H__
+#endif // !_STDINT_H
diff --git a/include/stdlib.h b/include/stdlib.h
new file mode 100644
index 0000000..9d6d5ac
--- /dev/null
+++ b/include/stdlib.h
@@ -0,0 +1,4 @@
+#ifndef _STDLIB_H
+#define _STDLIB_H
+
+#endif // !_STDLIB_H
diff --git a/include/string.h b/include/string.h
new file mode 100644
index 0000000..94becae
--- /dev/null
+++ b/include/string.h
@@ -0,0 +1,4 @@
+#ifndef _STRING_H
+#define _STRING_H
+
+#endif // !_STRING_H