diff -up data/reference/extension/curl/55/constants.json.rhel data/reference/extension/curl/55/constants.json
--- data/reference/extension/curl/55/constants.json.rhel	2021-01-13 14:52:01.078221323 +0100
+++ data/reference/extension/curl/55/constants.json	2021-01-13 14:56:11.536253445 +0100
@@ -1861,6 +1861,7 @@
         "ext_max": "",
         "php_min": "5.5.0",
         "php_max": "",
+        "optional": true,
         "php_excludes": ""
     },
     {
@@ -1869,6 +1870,7 @@
         "ext_max": "",
         "php_min": "5.5.0",
         "php_max": "",
+        "optional": true,
         "php_excludes": ""
     },
     {
@@ -1877,6 +1879,7 @@
         "ext_max": "",
         "php_min": "5.5.0",
         "php_max": "",
+        "optional": true,
         "php_excludes": ""
     },
     {
@@ -1885,6 +1888,7 @@
         "ext_max": "",
         "php_min": "5.5.0",
         "php_max": "",
+        "optional": true,
         "php_excludes": ""
     },
     {
@@ -1893,6 +1897,7 @@
         "ext_max": "",
         "php_min": "5.5.19RC1",
         "php_max": "",
+        "optional": true,
         "php_excludes": "5.6.0, 5.6.0RC1, 5.6.0RC2, 5.6.0RC3, 5.6.0RC4, 5.6.1, 5.6.1RC1, 5.6.2",
         "dependencies": [
             {
@@ -1907,6 +1912,7 @@
         "ext_max": "",
         "php_min": "5.5.19RC1",
         "php_max": "",
+        "optional": true,
         "php_excludes": "5.6.0, 5.6.0RC1, 5.6.0RC2, 5.6.0RC3, 5.6.0RC4, 5.6.1, 5.6.1RC1, 5.6.2",
         "dependencies": [
             {
@@ -1921,6 +1927,7 @@
         "ext_max": "",
         "php_min": "5.5.19RC1",
         "php_max": "",
+        "optional": true,
         "php_excludes": "5.6.0, 5.6.0RC1, 5.6.0RC2, 5.6.0RC3, 5.6.0RC4, 5.6.1, 5.6.1RC1, 5.6.2",
         "dependencies": [
             {