Portability problems fixed by Gnulib:
@itemize
@item
+@code{volatile sig_atomic_t} is rejected by older compilers on some
+platforms:
+AIX.
+@item
@code{sigset_t} is only declared in <sys/types.h> on some platforms:
mingw.
@item
@item
The signal @code{SIGPIPE} is not defined on some platforms:
mingw.
+@item
+The macro @code{SA_NODEFER} is not defined on some platforms:
+Interix 3.5.
@end itemize
Portability problems not fixed by Gnulib: