Flawfinder version 2.0.10, (C) 2001-2019 David A. Wheeler.
Number of rules (primarily dangerous function names) in C/C++ ruleset: 223
Examining data/autoconf2.13-2.13/acconfig.h

FINAL RESULTS:

data/autoconf2.13-2.13/acconfig.h:258:8:  [2] (race) vfork:
  On some old systems, vfork() permits race conditions, and it's very
  difficult to use correctly (CWE-362). Use fork() instead.
#undef vfork

ANALYSIS SUMMARY:

Hits = 1
Lines analyzed = 277 in approximately 0.03 seconds (8283 lines/second)
Physical Source Lines of Code (SLOC) = 82
Hits@level = [0]   0 [1]   0 [2]   1 [3]   0 [4]   0 [5]   0
Hits@level+ = [0+]   1 [1+]   1 [2+]   1 [3+]   0 [4+]   0 [5+]   0
Hits/KSLOC@level+ = [0+] 12.1951 [1+] 12.1951 [2+] 12.1951 [3+]   0 [4+]   0 [5+]   0
Dot directories skipped = 1 (--followdotdir overrides)
Minimum risk level = 1
Not every hit is necessarily a security vulnerability.
There may be other security vulnerabilities; review your code!
See 'Secure Programming HOWTO'
(https://dwheeler.com/secure-programs) for more information.