From @jhi

In http​://perl5.git.perl.org/perl.git/commit/16d89be8 I (jhi) exposed the U64/I64 to anyone, not just PERL_CORE.

This is a meta ticket for any CPAN breakages caused by this​: because of the long history, some XS might have
workarounds for the lack of U64/I64.

From @jhi

Not a CPAN breakage directly, but net-snmp breakage, noticed by Mathieu Arnold <mat@​freebsd.org>

What happened was that the SNMP code has its own U64 which was a struct of two ulongs {hi, lo}; probably to emulate a 64-bit int in 32-bit lands.

The workaround which was tested to work was to add

+#ifdef U64TYPE
+#define U64 U64pairU32
+#endif

before any

#include <net-snmp/net-snmp-config.h>

in any code using the Perl headers.

Mathieu submitted a patch for net-snmp for this​:

http​://sourceforge.net/p/net-snmp/patches/1307/