diff --git a/map.jinja b/map.jinja
--- a/map.jinja
+++ b/map.jinja
@@ -79,17 +79,20 @@
 
 {% set packages_prefixes = salt['grains.filter_by']({
     'Debian': {
+        'pecl': 'php-',
         'php': 'php7.2-',
         'python2': '',
         'python3': 'python3-',
         'rubygem': '',
     },
     'RedHat': {
+        'pecl': 'php-pecl-',
         'python2': 'python-',
         'python3': 'python3-',
         'rubygem': 'rubygem-',
     },
     'FreeBSD' : {
+        'pecl': 'php72-pecl-',
         'php': 'php72-',
         'python2': 'py27-',
         'python3': 'py36-',
diff --git a/roles/shellserver/userland-software/base.sls b/roles/shellserver/userland-software/base.sls
--- a/roles/shellserver/userland-software/base.sls
+++ b/roles/shellserver/userland-software/base.sls
@@ -184,6 +184,9 @@
       - {{ packages_prefixes.php }}pdo_sqlite
       {% endif %}
 
+      # PECL extensions
+      - {{ packages_prefixes.pecl }}yaml
+
       # PHP utilities
 
       {% if grains['os'] != 'FreeBSD' %}