I am uploading a NMU to fix this.
Please find the debdiff attached.
diff -Nru swift-im-5.0~alpha2.145.g12d031cf8+dfsg/debian/changelog
swift-im-5.0~alpha2.145.g12d031cf8+dfsg/debian/changelog
--- swift-im-5.0~alpha2.145.g12d031cf8+dfsg/debian/changelog 2024-08-03
09:41:56.000000000 +0200
+++ swift-im-5.0~alpha2.145.g12d031cf8+dfsg/debian/changelog 2025-06-03
16:46:02.000000000 +0200
@@ -1,3 +1,11 @@
+swift-im (5.0~alpha2.145.g12d031cf8+dfsg-4.1) unstable; urgency=medium
+
+ * Non-maintainer upload.
+ * Fix build with current libxml2 package version. (Closes: #1088140)
+ * Drop unnecessary Build-Depends: libqt5webkit5-dev. (Closes: #1093866)
+
+ -- Bastian Germann <b...@debian.org> Tue, 03 Jun 2025 16:46:02 +0200
+
swift-im (5.0~alpha2.145.g12d031cf8+dfsg-4) unstable; urgency=medium
* Fix FTBFS with miniupnpc 2.2.8 (Closes: #1076692).
diff -Nru swift-im-5.0~alpha2.145.g12d031cf8+dfsg/debian/control
swift-im-5.0~alpha2.145.g12d031cf8+dfsg/debian/control
--- swift-im-5.0~alpha2.145.g12d031cf8+dfsg/debian/control 2024-08-03
09:30:57.000000000 +0200
+++ swift-im-5.0~alpha2.145.g12d031cf8+dfsg/debian/control 2025-06-03
16:46:02.000000000 +0200
@@ -20,7 +20,6 @@
libminiupnpc-dev,
libnatpmp-dev,
libqt5svg5-dev,
- libqt5webkit5-dev,
libqt5x11extras5-dev,
libsqlite3-dev,
libssl-dev,
diff -Nru swift-im-5.0~alpha2.145.g12d031cf8+dfsg/debian/patches/libxml2.patch
swift-im-5.0~alpha2.145.g12d031cf8+dfsg/debian/patches/libxml2.patch
--- swift-im-5.0~alpha2.145.g12d031cf8+dfsg/debian/patches/libxml2.patch
1970-01-01 01:00:00.000000000 +0100
+++ swift-im-5.0~alpha2.145.g12d031cf8+dfsg/debian/patches/libxml2.patch
2025-06-03 16:46:02.000000000 +0200
@@ -0,0 +1,13 @@
+Bug-Debian: https://bugs.debian.org/1088140
+---
+---
swift-im-5.0~alpha2.145.g12d031cf8+dfsg.orig/Swiften/Parser/LibXMLParser.cpp
++++ swift-im-5.0~alpha2.145.g12d031cf8+dfsg/Swiften/Parser/LibXMLParser.cpp
+@@ -103,7 +103,7 @@ static void handleWarning(void*, const c
+ static void handleGenericError(void*, const char*, ... ) {
+ }
+
+-static void handleStructuredError(void *userData, const xmlError *error) {
++static void handleStructuredError(void *userData, xmlErrorPtr) {
+ }
+
+ bool LibXMLParser::initialized = false;
diff -Nru swift-im-5.0~alpha2.145.g12d031cf8+dfsg/debian/patches/series
swift-im-5.0~alpha2.145.g12d031cf8+dfsg/debian/patches/series
--- swift-im-5.0~alpha2.145.g12d031cf8+dfsg/debian/patches/series
2024-07-30 04:39:31.000000000 +0200
+++ swift-im-5.0~alpha2.145.g12d031cf8+dfsg/debian/patches/series
2025-06-03 16:46:02.000000000 +0200
@@ -4,3 +4,4 @@
fix-version-h.patch
fix-ftbfs-miniupnpc2.8.patch
fix-ftbs-gcc14.patch
+libxml2.patch
