diff --git a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -4,7 +4,7 @@
 project(KCodecs VERSION ${KF5_VERSION})
 
 include(FeatureSummary)
-find_package(ECM 5.55.0  NO_MODULE)
+find_package(ECM 5.54.0  NO_MODULE)
 set_package_properties(ECM PROPERTIES TYPE REQUIRED DESCRIPTION "Extra CMake Modules." URL "https://projects.kde.org/projects/kdesupport/extra-cmake-modules")
 feature_summary(WHAT REQUIRED_PACKAGES_NOT_FOUND FATAL_ON_MISSING_REQUIRED_PACKAGES)
 
diff --git a/src/kcodecs.h b/src/kcodecs.h
--- a/src/kcodecs.h
+++ b/src/kcodecs.h
@@ -139,8 +139,10 @@
  *
  * @param in   data to be uuencoded
  * @return     uuencoded string.
+ * @deprecated Always returns an empty bytearray.
  */
-KCODECS_EXPORT QByteArray uuencode(const QByteArray &in);
+// TODO KF6 Remove? Or Make uuencode work?
+KCODECS_DEPRECATED_EXPORT QByteArray uuencode(const QByteArray &in);
 
 /**
  * Encodes the given data using the uuencode algorithm.
@@ -155,9 +157,10 @@
  * output array will be lost.
  *
  * @param in   data to be uuencoded.
- * @param out  uudecoded data.
+ * @param out  an empty byte array
  */
-KCODECS_EXPORT void uuencode(const QByteArray &in, QByteArray &out);
+// TODO KF6 Remove? Or Make uuencode work?
+KCODECS_DEPRECATED_EXPORT void uuencode(const QByteArray &in, QByteArray &out);
 
 /**
  * Decodes the given data using the uudecode algorithm.