$ gcc exploit.c -o exploit.o
exploit.c:1: error: syntax error before '<' token
In file included from exploit.c:2:
/usr/include/stdlib.h:137: error: syntax error before "__ctype_get_mb_cur_max"
In file included from /usr/include/sys/types.h:266,
                 from /usr/include/stdlib.h:416,
                 from exploit.c:2:
/usr/include/bits/pthreadtypes.h:50: error: syntax error before "size_t"
/usr/include/bits/pthreadtypes.h:53: error: syntax error before "__stacksize"
In file included from exploit.c:2:
/usr/include/stdlib.h:433: error: syntax error before "size_t"
/usr/include/stdlib.h:462: error: syntax error before "size_t"
/usr/include/stdlib.h:556: error: syntax error before "__size"
/usr/include/stdlib.h:558: error: syntax error before "__nmemb"
/usr/include/stdlib.h:567: error: syntax error before "size_t"
In file included from /usr/include/stdlib.h:578,
                 from exploit.c:2:
/usr/include/alloca.h:33: error: syntax error before "__size"
In file included from exploit.c:2:
/usr/include/stdlib.h:583: error: syntax error before "__size"
/usr/include/stdlib.h:739: error: syntax error before "size_t"
/usr/include/stdlib.h:743: error: syntax error before "size_t"
/usr/include/stdlib.h:812: error: syntax error before "size_t"
/usr/include/stdlib.h:815: error: syntax error before "size_t"
/usr/include/stdlib.h:819: error: syntax error before "size_t"
/usr/include/stdlib.h:822: error: syntax error before "size_t"
/usr/include/stdlib.h:830: error: syntax error before "size_t"
/usr/include/stdlib.h:834: error: syntax error before "size_t"
/usr/include/stdlib.h:841: error: syntax error before "mbstowcs"
/usr/include/stdlib.h:842: error: syntax error before "size_t"
/usr/include/stdlib.h:844: error: syntax error before "wcstombs"
/usr/include/stdlib.h:845: error: syntax error before "size_t"
In file included from exploit.c:3:
/usr/include/unistd.h:312: error: syntax error before "size_t"
/usr/include/unistd.h:318: error: syntax error before "size_t"
/usr/include/unistd.h:448: error: syntax error before "size_t"
In file included from exploit.c:3:
/usr/include/unistd.h:538: error: syntax error before "confstr"
/usr/include/unistd.h:538: error: syntax error before "size_t"
/usr/include/unistd.h:707: error: syntax error before "size_t"
/usr/include/unistd.h:732: error: syntax error before "size_t"
In file included from exploit.c:3:
/usr/include/unistd.h:783: error: syntax error before "size_t"
/usr/include/unistd.h:790: error: syntax error before "size_t"
/usr/include/unistd.h:800: error: syntax error before "size_t"
/usr/include/unistd.h:801: error: syntax error before "size_t"
/usr/include/unistd.h:818: error: syntax error before "size_t"