crypto/sha256.cpp: In function ‘std::string SHA256AutoDetect()’:
crypto/sha256.cpp:537:83: error: inconsistent operand constraints in an ‘asm’
   __asm__ ("cpuid" : "=a"(a), "=b"(b), "=c"(c), "=d"(d) : "0"(leaf), "2"(subleaf));
                                                                                   ^
crypto/sha256.cpp:537:83: error: inconsistent operand constraints in an ‘asm’
   __asm__ ("cpuid" : "=a"(a), "=b"(b), "=c"(c), "=d"(d) : "0"(leaf), "2"(subleaf));
                                                                                   ^
make[2]: *** [crypto/crypto_libbitcoin_crypto_base_a-sha256.o] Error 1
make[2]: *** Waiting for unfinished jobs....
  CXXLD    libunivalue.la
make[3]: Leaving directory `/home/ubuntu/build/bitcoin/distsrc-i686-pc-linux-gnu/src/univalue'
make[2]: Leaving directory `/home/ubuntu/build/bitcoin/distsrc-i686-pc-linux-gnu/src'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/ubuntu/build/bitcoin/distsrc-i686-pc-linux-gnu/src'
make: *** [all-recursive] Error 1