diff --git a/CMakeLists.txt b/CMakeLists.txt
index f391940..8abe345 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,6 +1,7 @@
 cmake_minimum_required(VERSION 3.9)
 project(dereko2vec VERSION 0.9.1 DESCRIPTION "Fork from wang2vec with extensions for re-training and count based models")
 option(STATIC_DEREKO2VEC "Build dereko2vec as a static binary" OFF)
+option(STATIC_ROCKSDB "Link rocksdb and collocatordb statically, everything else shared" OFF)
 if (STATIC_DEREKO2VEC AND APPLE)
     message(FATAL_ERROR "STATIC_DEREKO2VEC does not work on MacOS, which ships "
             "no static system libraries. Build without it.")
@@ -31,12 +32,14 @@
 include_directories(/usr/local/include /usr/local/kl/include /opt/homebrew/include)
 link_directories(/usr/local/kl/lib /usr/local/lib /usr/local/lib64 /opt/homebrew/lib)
 
-# A static dereko2vec needs everything as a static library. An ordinary build
-# takes the shared ones, and it has to take them explicitly: a leftover static
-# library below /usr/local would otherwise win over the shared library of the
-# distribution, because cmake weighs the search path higher than the suffix.
-# Set -DCOLLOCATORDB=<path> or -DROCKSDB=<path> to pick specific ones.
-if (STATIC_DEREKO2VEC)
+# A static dereko2vec needs everything as a static library. With STATIC_ROCKSDB
+# only rocksdb and collocatordb are static and the compression libraries stay
+# shared, which is the fast indexing build the README describes. An ordinary
+# build takes the shared ones, and it has to take them explicitly: a leftover
+# static library below /usr/local would otherwise win over the shared library
+# of the distribution, because cmake weighs the search path higher than the
+# suffix. Set -DCOLLOCATORDB=<path> or -DROCKSDB=<path> to pick specific ones.
+if (STATIC_DEREKO2VEC OR STATIC_ROCKSDB)
     find_library(COLLOCATORDB libcollocatordb_static.a)
     find_library(ROCKSDB librocksdb.a)
 else ()
@@ -50,16 +53,17 @@
 if (NOT COLLOCATORDB)
     message(FATAL_ERROR "No collocatordb found. Please install it from "
             "https://korap.ids-mannheim.de/gerrit/plugins/gitiles/ids-kl/collocatordb"
-            " - a static dereko2vec needs libcollocatordb_static.a, otherwise "
+            " - a static build needs libcollocatordb_static.a, otherwise "
             "libcollocatordb.so is enough.")
 endif ()
 if (NOT ROCKSDB)
     message(FATAL_ERROR "No rocksdb found. Install the rocksdb development "
             "package of your distribution, e.g. librocksdb-dev or "
-            "rocksdb-devel. Where there is none, or where it is older than the "
-            "one collocatordb was built against, build rocksdb and say where "
-            "it is: -DCMAKE_PREFIX_PATH=<prefix it was installed to>. It has "
-            "to be the same rocksdb that collocatordb was built against.")
+            "rocksdb-devel. Where there is none, or where a static one is "
+            "needed, scripts/build-rocksdb.sh builds one into a prefix of its "
+            "own; then say where it is: -DCMAKE_PREFIX_PATH=<prefix>. It has "
+            "to be the same rocksdb that collocatordb was built against, "
+            "which the script takes care of on its own.")
 endif ()
 message(STATUS "Using collocatordb ${COLLOCATORDB}")
 message(STATUS "Using RocksDB ${ROCKSDB}")