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updated Building.md

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@ -141,7 +141,6 @@ So far, the following portions of n2n's code benefit from hardware features:
AES: AES-NI
ChaCha20: SSE2, SSSE3
SPECK: SSE2, SSSE3, AVX2, AVX512, (NEON)
Pearson Hashing: AES-NI
Random Numbers: RDSEED, RDRND (not faster but more random seed)
```
@ -149,6 +148,8 @@ The compilations flags could easily be combined:
`./configure CFLAGS="-O3 -march=native"`.
There are reports of compile errors showing `n2n_seed': random_numbers.c:(.text+0x214): undefined reference to _rdseed64_step'` even though the CPU should support it, see #696. In this case, best solution found so far is to disable `RDSEED` support by adding `-U__RDSEED__` to the `CFLAGS`.
## OpenSSL Support
Some ciphers' speed can take advantage of OpenSSL support which is disabled by default as the built-in ciphers already prove reasonably fast in most cases. OpenSSL support can be configured using