-void _Exit( int status );
-void exit( int status );
-void abort( void );
-char * getenv( const char * name );
-int system( const char * s );
+/* Integer arithmetic functions */
+
+int abs( int j );
+long int labs( long int j );
+long long int llabs( long long int j );
+
+div_t div( int numer, int denom );
+ldiv_t ldiv( long int numer, long int denom );
+lldiv_t lldiv( long long int numer, long long int denom );
+
+/* Multibyte / wide character conversion functions */
+
+/* TODO: Macro MB_CUR_MAX */
+
+/* Multibyte / wide string conversion functions */