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diff --git a/include/stdarg.h b/include/stdarg.h
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+/**
+ * slibc — Yet another C library
+ * Copyright © 2015  Mattias Andrée (maandree@member.fsf.org)
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef _STDARG_H
+#define _STDARG_H
+#include <slibc/version.h>
+
+
+#include <bits/stdarg.h>
+
+
+/* If <bits/stdarg.h> does not define what is required,
+ * fall back to compiler-builtin definitions. */
+
+
+
+/**
+ * State of variadic argument-reading.
+ */
+#ifndef __DEFINED_va_list
+# define __DEFINED_va_list
+typedef __builtin_va_list va_list;
+#endif
+
+/**
+ * Prologue to using a variadic arguments.
+ * 
+ * @param  state:va_list    The state of the variadic argument-reading.
+ * @param  last:identifier  The the last non-variadic argument.
+ */
+#ifndef va_start
+# define va_start(state, last)  __builtin_va_start(state, last)
+#endif
+
+/**
+ * Epilogue to using a variadic arguments.
+ * 
+ * @param  state:va_list  The state of the variadic argument-reading.
+ */
+#ifndef va_end
+# define va_end(state)  __builtin_va_end(state)
+#endif
+
+/**
+ * Get the next variadic argument.
+ * 
+ * @param   state:va_list    The state of the variadic argument-reading.
+ * @param   type:identifier  The data type used in the called to the function,
+ *                           must match exactly. Arguments smaller than `int`
+ *                           are promoted in the cal, thus you must not use a
+ *                           type smaller than `int`, lest bad things will happen.
+ * @return  :`type`          The next argument.
+ */
+#ifndef va_arg
+# define va_arg(state, type)  __builtin_va_arg(state, type)
+#endif
+
+/**
+ * Copy a state of variadic argument-reading.
+ * 
+ * @param  destination:va_list  The copy if `source`.
+ * @param  source:va_list       The state of the variadic argument-reading.
+ */
+#ifndef va_copy
+# define va_copy(destination, source)  __builtin_va_copy(destination, source)
+#endif
+
+
+
+#endif
+