[AA-lib] Gentoo QA Notice: "poor programming practices"

When installing AA-lib on Gentoo (amd64), portage complains about some compiler warnings (gcc 4.3.3):

QA Notice: Package has poor programming practices which may compile fine but exhibit random runtime failures.
aainfo.c:12: warning: incompatible implicit declaration of built-in function 'exit'
aainfo.c:17: warning: incompatible implicit declaration of built-in function 'exit'
aatest.c:8: warning: incompatible implicit declaration of built-in function 'strcpy'
aatest.c:11: warning: incompatible implicit declaration of built-in function 'exit'
aatest.c:16: warning: incompatible implicit declaration of built-in function 'exit'
aatest.c:21: warning: incompatible implicit declaration of built-in function 'exit'
aafire.c:55: warning: incompatible implicit declaration of built-in function 'exit'
aafire.c:68: warning: incompatible implicit declaration of built-in function 'exit'
aafire.c:154: warning: incompatible implicit declaration of built-in function 'exit'
aasavefont.c:10: warning: incompatible implicit declaration of built-in function 'exit'

Please do not file a Gentoo bug and instead report the above QA issues directly to the upstream developers of this software.