use Config;;
printf "$_ => %s", $Config{ $_ }||'n/a' for grep /size/i, keys %Config;;

charsize => 1
d_chsize => define
doublesize => 8
fpossize => 8
gidsize => 4
i16size => 2
i32size => 4
i64size => 8
i8size => 1
intsize => 4 
ivsize => 4
longdblsize => 10
longlongsize => 8
longsize => 4
lseeksize => 8
nvsize => 8
ptrsize => 4
shortsize => 2
sig_size => 27
sizesize => 4
sizetype => size_t
socksizetype => int
ssizetype => int
u16size => 2
u32size => 4
u64size => 8
u8size => 1
uidsize => 4
uvsize => 4