Please check the build logs for more information.
See Builds for ideas on how to fix a failed build, or Metadata for how to configure docs.rs builds.
If you believe this is docs.rs' fault, open an issue.
couchbase-lite-rust 
Rust wrapper for couchbase-lite-core lightweight, embedded, syncable NoSQL database engine.
Quote from couchbase-lite-core
Couchbase Lite Core (aka LiteCore) is the next-generation core storage and query engine for [Couchbase Lite][CBL]. It provides a cross-platform implementation of the database CRUD and query features, document versioning, and replication/sync. All platform implementations of Couchbase Lite (from 2.0 onward) are built atop this core, adding higher-level language & platform bindings. But LiteCore may find other uses too, perhaps for applications that want a fast minimalist data store with map/reduce indexing and queries, but don't need the higher-level features of Couchbase Lite.
Optional features
couchbase-lite-core-sys
Build script can either download couchbase-lite-core library (C/C++) with help of git ("git-download" feature),
or you can provide path to source code via COUCHBASE_LITE_CORE_SRC_DIRenvironment variable.
After that build script can run cmake and proper build command for you ("build" feature)
or you can build couchbase-lite-core by yourself and provide path to build directory via COUCHBASE_LITE_CORE_BUILD_DIR environment variable.
Also it is possible that static libraries in COUCHBASE_LITE_CORE_BUILD_DIR has unique placement,
for example if you use cmake to generate XCode/Visual Studio project,
then you can use COUCHBASE_LITE_CORE_BUILD_DIRS environment variable in such way: "directory/with/library1^directory/with/library2".