Build failure with PHP 7.3

[hseagle2015]

Compiling php-apm on CentOS 7 server with PHP 7.3.7 (installed from IUS yum repo) is failing. Here are steps to reproduce the problem:

phpize
 ./configure --without-sqlite3 --without-mysql --disable-socket

And here's the error I'm getting:

/bin/sh /home/user/APM/libtool --mode=compile cc  -I. -I/home/user/APM -DPHP_ATOM_INC -I/home/user/APM/include -I/home/user/APM/main -I/home/user/APM -I/usr/include/php -I/usr/include/php/main -I/usr/include/php/TSRM -I/usr/include/php/Zend -I/usr/include/php/ext -I/usr/include/php/ext/date/lib  -DHAVE_CONFIG_H  -g -O2   -c /home/user/APM/backtrace.c -o backtrace.lo 
libtool: compile:  cc -I. -I/home/user/APM -DPHP_ATOM_INC -I/home/user/APM/include -I/home/user/APM/main -I/home/user/APM -I/usr/include/php -I/usr/include/php/main -I/usr/include/php/TSRM -I/usr/include/php/Zend -I/usr/include/php/ext -I/usr/include/php/ext/date/lib -DHAVE_CONFIG_H -g -O2 -c /home/user/APM/backtrace.c  -fPIC -DPIC -o .libs/backtrace.o
/home/user/APM/backtrace.c: In function 'append_flat_zval_r':
/home/user/APM/backtrace.c:391:79: error: 'struct <anonymous>' has no member named 'nApplyCount'
    if (ZEND_HASH_APPLY_PROTECTION(Z_ARRVAL_P(expr)) && ++Z_ARRVAL_P(expr)->u.v.nApplyCount>1) {
                                                                               ^
/home/user/APM/backtrace.c:397:26: error: 'struct <anonymous>' has no member named 'nApplyCount'
     Z_ARRVAL_P(expr)->u.v.nApplyCount--;
                          ^
/home/user/APM/backtrace.c:407:26: error: 'struct <anonymous>' has no member named 'nApplyCount'
     Z_ARRVAL_P(expr)->u.v.nApplyCount--;
                          ^
make: *** [backtrace.lo] Error 1

I'd appreciate help in debugging this problem. Thank you.