problem with new install on new Centos 7.5 system

Hello,

I have been running Horde for many years on Centos 6 and am working on  
replacing with Centos 7, but am having trouble installing Horde on it.  
Any thoughts on what I could do to get past this would be greatly  
appreciated.

I am following instructions at:
https://www.horde.org/apps/groupware/docs/INSTALL

In short, the three issues I'm encountering are:
  - step 2.5: 'pecl install http' fails due to "no releases available"
  - step 3.1: 'pear install -a horde/groupware' fails a few pieces:
              horde/Horde_Backup
              pecl/sasl
              pecl/idn
  - step 3.3: 'groupware-install' fails due to the "pear" directory  
not being present in the horde directory


The new system is:
CentOS Linux release 7.5.1804 (Core)
Linux c7.burr.cc 3.10.0-862.14.4.el7.x86_64 #1 SMP Wed Sep 26 15:12:11  
UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

skipped (1) quick install

(2) Prerequisites:
   1) # rpm -q httpd
      httpd-2.4.6-80.el7.centos.1.x86_64
      (Apache 2)

   2) configured in /etc/httpd/conf/httpd.conf

   3) # rpm -q php
      php-5.4.16-45.el7.x86_64

   4) # pear config-show | grep 'PEAR directory'
      PEAR directory                 php_dir          /usr/share/pear

      # pear list | grep -e Date -e DNS -e Weather -e Fstab
      Date                       1.4.7   stable
      (skipping all the Date_Holidays_*)
      File_Fstab                 2.0.3   stable
      Net_DNS2                   1.4.4   stable
      Services_Weather           1.4.7   stable

   5) # pecl list
      Installed packages, channel pecl.php.net:
      =========================================
      Package  Version State
      APC      3.1.13  beta
      LZF      1.6.6   stable
      apcu     4.0.11  stable
      igbinary 2.0.8   stable
      imagick  3.4.3   stable
      intl     3.0.0   stable
      memcache 3.0.8   beta
      mongo    1.6.16  stable

      # pecl list -c horde | grep lz4
      horde_lz4                    1.0.10  stable

*    # pecl install http
*    No releases available for package "pecl.php.net/http"
*    install failed

   # rpm -q aspell
   aspell-0.60.6.1-9.el7.x86_64
   # rpm -q postfix
   postfix-2.10.1-6.el7.x86_64
   # rpm -q vsftpd
   vsftpd-3.0.2-22.el7.x86_64

(3)
   3.1) see install.txt
   3.2) not done
   3.3) see install.txt

More info is available in files at http://www.burr.cc/~egburr/horde_inst/

etc_php.d_horde-related.ini -- /etc/php.d/horde-related.ini
install.txt -- output from steps 3.1 and 3.3 above
notes -- the above notes
pear.install.Horde_Backup -- attempt to install Horde_Backup
pear.list -- list of installed pear modules
pear.list.horde -- list of installed pear horde modules
pecl.install.idn -- attempt to install idn
pecl.instal.sasl -- attempt to install sasl
pecl.list -- list of installed pecl modules
rpm.qa -- list of listalled rpm packages

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