I don't see anything wrong here except that error about the notification.
[root@vps log]# tail -50 php-selector-rebuild.log
/bin/sh /usr/local/src/apcu-5.1.12/libtool --mode=compile cc -D_GNU_SOURCE -DZEND_ENABLE_STATIC_TSRMLS_CACHE=1 -I. -I/usr/local/src/apcu-5.1.12 -DPHP_ATOM_INC -I/usr/local/src/apcu-5.1.12/include -I/usr/local/src/apcu-5.1.12/main -I/usr/local/src/apcu-5.1.12 -I/opt/alt/php-fpm73/usr/include/php -I/opt/alt/php-fpm73/usr/include/php/main -I/opt/alt/php-fpm73/usr/include/php/TSRM -I/opt/alt/php-fpm73/usr/include/php/Zend -I/opt/alt/php-fpm73/usr/include/php/ext -I/opt/alt/php-fpm73/usr/include/php/ext/date/lib -DHAVE_CONFIG_H -g -O2 -c /usr/local/src/apcu-5.1.12/apc_signal.c -o apc_signal.lo
cc -D_GNU_SOURCE -DZEND_ENABLE_STATIC_TSRMLS_CACHE=1 -I. -I/usr/local/src/apcu-5.1.12 -DPHP_ATOM_INC -I/usr/local/src/apcu-5.1.12/include -I/usr/local/src/apcu-5.1.12/main -I/usr/local/src/apcu-5.1.12 -I/opt/alt/php-fpm73/usr/include/php -I/opt/alt/php-fpm73/usr/include/php/main -I/opt/alt/php-fpm73/usr/include/php/TSRM -I/opt/alt/php-fpm73/usr/include/php/Zend -I/opt/alt/php-fpm73/usr/include/php/ext -I/opt/alt/php-fpm73/usr/include/php/ext/date/lib -DHAVE_CONFIG_H -g -O2 -c /usr/local/src/apcu-5.1.12/apc_signal.c -fPIC -DPIC -o .libs/apc_signal.o
/bin/sh /usr/local/src/apcu-5.1.12/libtool --mode=compile cc -D_GNU_SOURCE -DZEND_ENABLE_STATIC_TSRMLS_CACHE=1 -I. -I/usr/local/src/apcu-5.1.12 -DPHP_ATOM_INC -I/usr/local/src/apcu-5.1.12/include -I/usr/local/src/apcu-5.1.12/main -I/usr/local/src/apcu-5.1.12 -I/opt/alt/php-fpm73/usr/include/php -I/opt/alt/php-fpm73/usr/include/php/main -I/opt/alt/php-fpm73/usr/include/php/TSRM -I/opt/alt/php-fpm73/usr/include/php/Zend -I/opt/alt/php-fpm73/usr/include/php/ext -I/opt/alt/php-fpm73/usr/include/php/ext/date/lib -DHAVE_CONFIG_H -g -O2 -c /usr/local/src/apcu-5.1.12/apc_pool.c -o apc_pool.lo
cc -D_GNU_SOURCE -DZEND_ENABLE_STATIC_TSRMLS_CACHE=1 -I. -I/usr/local/src/apcu-5.1.12 -DPHP_ATOM_INC -I/usr/local/src/apcu-5.1.12/include -I/usr/local/src/apcu-5.1.12/main -I/usr/local/src/apcu-5.1.12 -I/opt/alt/php-fpm73/usr/include/php -I/opt/alt/php-fpm73/usr/include/php/main -I/opt/alt/php-fpm73/usr/include/php/TSRM -I/opt/alt/php-fpm73/usr/include/php/Zend -I/opt/alt/php-fpm73/usr/include/php/ext -I/opt/alt/php-fpm73/usr/include/php/ext/date/lib -DHAVE_CONFIG_H -g -O2 -c /usr/local/src/apcu-5.1.12/apc_pool.c -fPIC -DPIC -o .libs/apc_pool.o
/bin/sh /usr/local/src/apcu-5.1.12/libtool --mode=compile cc -D_GNU_SOURCE -DZEND_ENABLE_STATIC_TSRMLS_CACHE=1 -I. -I/usr/local/src/apcu-5.1.12 -DPHP_ATOM_INC -I/usr/local/src/apcu-5.1.12/include -I/usr/local/src/apcu-5.1.12/main -I/usr/local/src/apcu-5.1.12 -I/opt/alt/php-fpm73/usr/include/php -I/opt/alt/php-fpm73/usr/include/php/main -I/opt/alt/php-fpm73/usr/include/php/TSRM -I/opt/alt/php-fpm73/usr/include/php/Zend -I/opt/alt/php-fpm73/usr/include/php/ext -I/opt/alt/php-fpm73/usr/include/php/ext/date/lib -DHAVE_CONFIG_H -g -O2 -c /usr/local/src/apcu-5.1.12/apc_iterator.c -o apc_iterator.lo
cc -D_GNU_SOURCE -DZEND_ENABLE_STATIC_TSRMLS_CACHE=1 -I. -I/usr/local/src/apcu-5.1.12 -DPHP_ATOM_INC -I/usr/local/src/apcu-5.1.12/include -I/usr/local/src/apcu-5.1.12/main -I/usr/local/src/apcu-5.1.12 -I/opt/alt/php-fpm73/usr/include/php -I/opt/alt/php-fpm73/usr/include/php/main -I/opt/alt/php-fpm73/usr/include/php/TSRM -I/opt/alt/php-fpm73/usr/include/php/Zend -I/opt/alt/php-fpm73/usr/include/php/ext -I/opt/alt/php-fpm73/usr/include/php/ext/date/lib -DHAVE_CONFIG_H -g -O2 -c /usr/local/src/apcu-5.1.12/apc_iterator.c -fPIC -DPIC -o .libs/apc_iterator.o
/bin/sh /usr/local/src/apcu-5.1.12/libtool --mode=link cc -DPHP_ATOM_INC -I/usr/local/src/apcu-5.1.12/include -I/usr/local/src/apcu-5.1.12/main -I/usr/local/src/apcu-5.1.12 -I/opt/alt/php-fpm73/usr/include/php -I/opt/alt/php-fpm73/usr/include/php/main -I/opt/alt/php-fpm73/usr/include/php/TSRM -I/opt/alt/php-fpm73/usr/include/php/Zend -I/opt/alt/php-fpm73/usr/include/php/ext -I/opt/alt/php-fpm73/usr/include/php/ext/date/lib -DHAVE_CONFIG_H -g -O2 -o apcu.la -export-dynamic -avoid-version -prefer-pic -module -rpath /usr/local/src/apcu-5.1.12/modules apc.lo apc_lock.lo php_apc.lo apc_cache.lo apc_mmap.lo apc_shm.lo apc_sma.lo apc_stack.lo apc_signal.lo apc_pool.lo apc_iterator.lo -lrt
cc -shared .libs/apc.o .libs/apc_lock.o .libs/php_apc.o .libs/apc_cache.o .libs/apc_mmap.o .libs/apc_shm.o .libs/apc_sma.o .libs/apc_stack.o .libs/apc_signal.o .libs/apc_pool.o .libs/apc_iterator.o -lrt -Wl,-soname -Wl,apcu.so -o .libs/apcu.so
.libs/apc_mmap.o: In function `apc_mmap':
/usr/local/src/apcu-5.1.12/apc_mmap.c:95: warning: the use of `mktemp' is dangerous, better use `mkstemp'
creating apcu.la
(cd .libs && rm -f apcu.la && ln -s ../apcu.la apcu.la)
/bin/sh /usr/local/src/apcu-5.1.12/libtool --mode=install cp ./apcu.la /usr/local/src/apcu-5.1.12/modules
cp ./.libs/apcu.so /usr/local/src/apcu-5.1.12/modules/apcu.so
cp ./.libs/apcu.lai /usr/local/src/apcu-5.1.12/modules/apcu.la
PATH="$PATH:/sbin" ldconfig -n /usr/local/src/apcu-5.1.12/modules
----------------------------------------------------------------------
Libraries have been installed in:
/usr/local/src/apcu-5.1.12/modules
If you ever happen to want to link against installed libraries
in a given directory, LIBDIR, you must either use libtool, and
specify the full pathname of the library, or use the `-LLIBDIR'
flag during linking and do at least one of the following:
- add LIBDIR to the `LD_LIBRARY_PATH' environment variable
during execution
- add LIBDIR to the `LD_RUN_PATH' environment variable
during linking
- use the `-Wl,--rpath -Wl,LIBDIR' linker flag
- have your system administrator add LIBDIR to `/etc/ld.so.conf'
See any operating system documentation about shared libraries for
more information, such as the ld(1) and ld.so(8) manual pages.
----------------------------------------------------------------------
Build complete.
Don't forget to run 'make test'.
Installing shared extensions: /opt/alt/php-fpm73/usr/lib/php/extensions/no-debug-non-zts-20180731/
Installing header files: /opt/alt/php-fpm73/usr/include/php/
Creating config file
exe:/opt/alt/php-fpm73/usr/sbin/php-fpm
Redirecting to /bin/systemctl restart httpd.service
Build Completed
###################
Error:Can't add notification!
[root@vps log]#