diff --git a/data/supported-extensions b/data/supported-extensions
index 6d81c9c..6fa8e1c 100644
--- a/data/supported-extensions
+++ b/data/supported-extensions
@@ -96,6 +96,7 @@ wddx 5.5 5.6 7.0 7.1 7.2 7.3
 xdebug 5.5 5.6 7.0 7.1 7.2 7.3 7.4 8.0 8.1
 xhprof 5.5 5.6 7.0 7.1 7.2 7.3 7.4 8.0 8.1
 xlswriter 7.0 7.1 7.2 7.3 7.4 8.0
+xmldiff 5.5 5.6 7.0 7.1 7.2 7.3 7.4 8.0 8.1
 xmlrpc 5.5 5.6 7.0 7.1 7.2 7.3 7.4 8.0 8.1
 xsl 5.5 5.6 7.0 7.1 7.2 7.3 7.4 8.0 8.1
 yaml 5.5 5.6 7.0 7.1 7.2 7.3 7.4 8.0 8.1
diff --git a/install-php-extensions b/install-php-extensions
index 0ddec5c..1d35852 100755
--- a/install-php-extensions
+++ b/install-php-extensions
@@ -926,6 +926,12 @@ buildRequiredPackageLists() {
 			xlswriter@debian)
 				buildRequiredPackageLists_volatile="$buildRequiredPackageLists_volatile zlib1g-dev"
 				;;
+			xmldiff@alpine)
+				buildRequiredPackageLists_volatile="$buildRequiredPackageLists_volatile libxml2-dev"
+				;;
+			xmldiff@debian)
+				buildRequiredPackageLists_volatile="$buildRequiredPackageLists_volatile libxml2-dev"
+				;;
 			xmlrpc@alpine)
 				buildRequiredPackageLists_volatile="$buildRequiredPackageLists_volatile libxml2-dev"
 				;;
@@ -2238,6 +2244,10 @@ installRemoteModule() {
 				fi
 			fi
 			;;
+		xmldiff)
+			# whether to use system diffmark library
+			addConfigureOption 'with-libdiffmark' 'yes'
+			;;
 		xlswriter)
 			if test -z "$installRemoteModule_version" || test $(compareVersions "$installRemoteModule_version" 1.2.7) -ge 0; then
 				# enable reader supports?