diff --git a/include/lib/libc/stdlib.h b/include/lib/libc/stdlib.h
index 9aff5d0..edd6265 100644
--- a/include/lib/libc/stdlib.h
+++ b/include/lib/libc/stdlib.h
@@ -8,8 +8,8 @@
  * All rights reserved.
  */
 
-#ifndef _STDLIB_H
-#define _STDLIB_H
+#ifndef STDLIB_H
+#define STDLIB_H
 
 #include <stdlib_.h>
 
@@ -17,73 +17,10 @@
 #define NULL ((void *) 0)
 #endif
 
-#define _ATEXIT_MAX 32
+#define _ATEXIT_MAX 1
 
-#define MB_CUR_MAX 1
-#define RAND_MAX 32767
-
-typedef struct {
-	int quot, rem;
-} div_t;
-
-typedef struct {
-	long quot, rem;
-} ldiv_t;
-
-typedef struct {
-	long long quot, rem;
-} lldiv_t;
-
-extern double atof(const char *nptr);
-extern int atoi(const char *nptr);
-extern long int atol(const char *nptr);
-extern long long int atoll(const char *nptr);
-extern double strtod(const char * restrict nptr, char ** restrict endptr);
-extern float strtof(const char * restrict nptr, char ** restrict endptr);
-extern long double strtold(const char * restrict nptr, char ** restrict endptr);
-extern long int strtol(const char * restrict nptr, char ** restrict endptr, int base);
-extern long long int strtoll(const char * restrict nptr, char ** restrict endptr,
-                             int base);
-extern unsigned long int strtoul(const char * restrict nptr, char ** restrict endptr,
-                                 int base);
-extern unsigned long long int strtoull(const char * restrict nptr,
-                                       char ** restrict endptr, int base);
-extern int rand(void);
-extern void srand(unsigned int seed);
-extern void *calloc(size_t nmemb, size_t size);
-extern void free(void *ptr);
-extern void *malloc(size_t size);
-extern void *realloc(void *ptr, size_t size);
 extern void abort(void);
 extern int atexit(void (*func)(void));
 extern void exit(int status);
-extern void _Exit(int status);
-extern char *getenv(const char *name);
-extern int system(const char *string);
-extern void *bsearch(const void *key, const void *base, size_t nmemb, size_t size,
-                     int (*compar)(const void *, const void *));
-extern void qsort(void *base, size_t nmemb, size_t size,
-                  int (*compar)(const void *, const void *));
-extern int abs(int j);
-extern long int labs(long int j);
-extern long long int llabs(long long int j);
-extern div_t div(int numer, int denom);
-extern ldiv_t ldiv(long int numer, long int denom);
-extern lldiv_t lldiv(long long int numer, long long int denom);
-extern int mblen(const char *s, size_t n);
-extern int mbtowc(wchar_t * restrict pwc, const char * restrict s, size_t n);
-extern int wctomb(char *s, wchar_t wchar);
-extern size_t mbstowcs(wchar_t * restrict pwcs, const char * restrict s, size_t n);
-extern size_t wcstombs(char * restrict s, const wchar_t * restrict pwcs, size_t n);
 
-#ifdef __USE_MACROS
-extern int __abs;
-extern long __labs;
-extern long long __llabs;
-
-#define abs(x)   (__abs = (x), (__abs) < 0 ? -__abs :  __abs)
-#define labs(x)  (__labs = (x), (__labs) < 0 ? -__labs :  __labs)
-#define llabs(x) (__llabs = (x), (__llabs) < 0 ? -__llabs :  __llabs)
-#endif
-
-#endif
+#endif /* STDLIB_H */