#include inside a function definition?!

linpack.c

// from linpack benchmark. source: http://www.netlib.org/benchmark/linpackc


/*----------------------*/ 
REAL second()
{
#include <sys/time.h>
#include <sys/resource.h>

struct rusage ru;
REAL t ;

void getrusage();
 
getrusage(RUSAGE_SELF,&ru) ;
 
t = (REAL) (ru.ru_utime.tv_sec+ru.ru_stime.tv_sec) + 
    ((REAL) (ru.ru_utime.tv_usec+ru.ru_stime.tv_usec))/1.0e6 ;
return t ;
}