Hi, it is hard to say "easily" since the condition is confusing. For me, Debian unstable/stable CentOS 6.1 were all tested with self-compiled 7.4.1 (without any extra configuration arguments, all gcc/binutils whatsoever came with the OS). All failed. For Chris Dornan from haskell-cafe, he used 7.4.1 to make the code work. I have compared the .hi/.o files between him and me. Nothing interesting. Hoping this helps.
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