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diff --git a/libraries/qt6/README.SLACKWARE b/libraries/qt6/README.SLACKWARE
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+Slackware 15.0's version of clang fails to compile qt6, due to the
+following error:
+
+Linking CXX executable qtbase/lib64/bin/lupdate
+/usr/bin/ld: CMakeFiles/lupdate.dir/cpp_clang.cpp.o: undefined
+  reference to symbol '_ZTIN5clang7tooling21FrontendActionFactoryE'
+/usr/bin/ld: /usr/lib64/libclangTooling.so.13: error adding symbols:
+  DSO missing from command line
+clang-13: error: linker command failed with exit code 1
+
+To remedy this, Qt provides a prebuilt clang package that we bootstrap
+against.
+
+Qt6 will compile with multiple optional dependencies, such as:
+
+  assimp
+  (*)db2
+  (*)cerence
+  (*)directfb
+  (*)gn
+  (*)interbase
+  libb2
+  (*)litehtml
+  (*)lttn-ust
+  mold
+  postgresql
+  (*)sensorfw
+  (*)s-log2
+  snappy
+  (*)tslib
+  xmlstarlet
+
+  ...and possibly others.
+
+(*) = not available from SBo at the time of writing.