Compile and install the php7 expansion msgpack2.0.1 under ubuntu16.04

The following error message appears: I forgot all about the C language. I checked the source code of msgpack.c and I don’t know how to solve it. I hope an expert can help me

/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;

<code>                         ^</code>

/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;

<code>                         ^</code>

Makefile:193: recipe for target 'msgpack.lo' failed
make: * [msgpack.lo] Error 1

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The following error message appears: I forgot all about the C language. I checked the source code of msgpack.c and I don’t know how to solve it. I hope an expert can help me

/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;

<code>                         ^</code>

/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;

<code>                         ^</code>

Makefile:193: recipe for target 'msgpack.lo' failed
make: * [msgpack.lo] Error 1