Compile and install PHP7 extensions under ubuntu16.04 msgpack2.0.1

Prompt the following error: C language forgot, check the source of msgpack.c do not know if processing, Hope Master Help

/data/softwares/php-7.1.0beta3/ext/msgpack-2.0.1/msgpack.c:in function ' Ps_srlzr_decode_msgpack ':
/data/softwares/php-7.1.0beta3/ext/msgpack-2.0.1/msgpack.c:161:29:error:storage size of ' var_hash ' isn ' t known
msgpack_unserialize_data_t Var_hash;

                         ^

/data/softwares/php-7.1.0beta3/ext/msgpack-2.0.1/msgpack.c:in function ' php_msgpack_unserialize ':
/data/softwares/php-7.1.0beta3/ext/msgpack-2.0.1/msgpack.c:211:29:error:storage size of ' var_hash ' isn ' t known
msgpack_unserialize_data_t Var_hash;

                         ^

Makefile:193:recipe for Target ' Msgpack.lo ' failed
Make: * [Msgpack.lo] Error 1

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Prompt the following error: C language forgot, check the source of msgpack.c do not know if processing, Hope Master Help

/data/softwares/php-7.1.0beta3/ext/msgpack-2.0.1/msgpack.c:in function ' Ps_srlzr_decode_msgpack ':
/data/softwares/php-7.1.0beta3/ext/msgpack-2.0.1/msgpack.c:161:29:error:storage size of ' var_hash ' isn ' t known
msgpack_unserialize_data_t Var_hash;

                         ^

/data/softwares/php-7.1.0beta3/ext/msgpack-2.0.1/msgpack.c:in function ' php_msgpack_unserialize ':
/data/softwares/php-7.1.0beta3/ext/msgpack-2.0.1/msgpack.c:211:29:error:storage size of ' var_hash ' isn ' t known
msgpack_unserialize_data_t Var_hash;

                         ^

Makefile:193:recipe for Target ' Msgpack.lo ' failed
Make: * [Msgpack.lo] Error 1

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