diff --git a/plugins/libsinglefileplugin/CMakeLists.txt b/plugins/libsinglefileplugin/CMakeLists.txt
index 7e22b84c..88d6a18b 100644
--- a/plugins/libsinglefileplugin/CMakeLists.txt
+++ b/plugins/libsinglefileplugin/CMakeLists.txt
@@ -1,96 +1,96 @@
 set(kerfuffle_singlefile_SRCS singlefileplugin.cpp)
 
 ecm_qt_declare_logging_category(kerfuffle_singlefile_SRCS
                                 HEADER ark_debug.h
                                 IDENTIFIER ARK
                                 CATEGORY_NAME ark.singlefile)
 
 set(SUPPORTED_LIBSINGLEFILE_MIMETYPES "")
 set(INSTALLED_LIBSINGLEFILE_PLUGINS "")
 
 # This MIME type was originally set in ark.desktop but is does not
 # seem to be supported anywhere.  Assuming that, if it were supported,
 # it would be here.
 set(SUPPORTED_LIBSINGLEFILE_MIMETYPES "${SUPPORTED_LIBSINGLEFILE_MIMETYPES}application/x-compress;")
 
 #
 # GZip files
 #
 find_package(ZLIB)
 set_package_properties(ZLIB PROPERTIES
                        URL "http://www.zlib.net/"
                        DESCRIPTION "The Zlib compression library"
                        PURPOSE "Required for .gz format support in Ark")
 
 if (ZLIB_FOUND)
     set(kerfuffle_libgz_SRCS gzplugin.cpp ${kerfuffle_singlefile_SRCS})
     set(SUPPORTED_LIBSINGLEFILE_MIMETYPES "${SUPPORTED_LIBSINGLEFILE_MIMETYPES}application/gzip;")
 
     set(SUPPORTED_MIMETYPES "application/gzip")
 
     configure_file(
         ${CMAKE_CURRENT_SOURCE_DIR}/kerfuffle_libgz.json.cmake
         ${CMAKE_CURRENT_BINARY_DIR}/kerfuffle_libgz.json)
 
     kerfuffle_add_plugin(kerfuffle_libgz ${kerfuffle_libgz_SRCS})
     target_link_libraries(kerfuffle_libgz KF5::Archive)
 
     set(INSTALLED_LIBSINGLEFILE_PLUGINS "${INSTALLED_LIBSINGLEFILE_PLUGINS}kerfuffle_libgz;")
 endif (ZLIB_FOUND)
 
 #
 # Bzip2 files
 #
 find_package(BZip2)
 set_package_properties(BZip2 PROPERTIES
-                       URL "http://www.bzip.org/"
+                       URL "https://sourceware.org/bzip2/"
                        DESCRIPTION "The Bzip2 compression library"
                        PURPOSE "Required for .bz2 format support in Ark")
 
 if (BZIP2_FOUND)
 	set(kerfuffle_libbz2_SRCS bz2plugin.cpp ${kerfuffle_singlefile_SRCS})
 	set(SUPPORTED_LIBSINGLEFILE_MIMETYPES "${SUPPORTED_LIBSINGLEFILE_MIMETYPES}application/x-bzip;")
 
     set(SUPPORTED_MIMETYPES "application/x-bzip")
 
     configure_file(
         ${CMAKE_CURRENT_SOURCE_DIR}/kerfuffle_libbz2.json.cmake
         ${CMAKE_CURRENT_BINARY_DIR}/kerfuffle_libbz2.json)
 
     kerfuffle_add_plugin(kerfuffle_libbz2 ${kerfuffle_libbz2_SRCS})
     target_link_libraries(kerfuffle_libbz2 KF5::Archive)
 
     set(INSTALLED_LIBSINGLEFILE_PLUGINS "${INSTALLED_LIBSINGLEFILE_PLUGINS}kerfuffle_libbz2;")
 endif (BZIP2_FOUND)
 
 #
 # LZMA files
 #
 find_package(LibLZMA)
 set_package_properties(LibLZMA PROPERTIES
                        URL "http://tukaani.org/xz/"
                        DESCRIPTION "A LZMA compression library"
                        PURPOSE "Required for .xz and .lzma format support in Ark")
 
 if (LIBLZMA_FOUND)
 	set(kerfuffle_libxz_SRCS xzplugin.cpp ${kerfuffle_singlefile_SRCS})
 	set(SUPPORTED_LIBSINGLEFILE_MIMETYPES "${SUPPORTED_LIBSINGLEFILE_MIMETYPES}application/x-lzma;application/x-xz;")
 
     # NOTE: the first double-quotes of the first mime and the last
     # double-quotes of the last mime must NOT be escaped.
     set(SUPPORTED_MIMETYPES
         "application/x-lzma\",
         \"application/x-xz")
 
     configure_file(
         ${CMAKE_CURRENT_SOURCE_DIR}/kerfuffle_libxz.json.cmake
         ${CMAKE_CURRENT_BINARY_DIR}/kerfuffle_libxz.json)
 
     kerfuffle_add_plugin(kerfuffle_libxz ${kerfuffle_libxz_SRCS})
     target_link_libraries(kerfuffle_libxz KF5::Archive)
 
     set(INSTALLED_LIBSINGLEFILE_PLUGINS "${INSTALLED_LIBSINGLEFILE_PLUGINS}kerfuffle_libxz;")
 endif (LIBLZMA_FOUND)
 
 set(SUPPORTED_ARK_MIMETYPES "${SUPPORTED_ARK_MIMETYPES}${SUPPORTED_LIBSINGLEFILE_MIMETYPES}" PARENT_SCOPE)
 set(INSTALLED_KERFUFFLE_PLUGINS "${INSTALLED_KERFUFFLE_PLUGINS}${INSTALLED_LIBSINGLEFILE_PLUGINS}" PARENT_SCOPE)