-system("certtool --generate-privkey --outfile key.pem") or return 1;
-system("certtool --generate-self-signed --load-privkey key.pem --outfile cert.pem --template certtool.template") or return 1;
+if ( (my $status = system("certtool --generate-privkey --outfile key.pem")) ne 0) { return 1; }
+if ( (my $status = system("certtool --generate-self-signed --load-privkey key.pem --outfile cert.pem --template certtool.template")) ne 0) { return 1; }