cmake: Build univalue static library

src/CMakeLists.txt

@@ -28,6 +28,8 @@ target_link_libraries(bitcoin_clientversion
 )
 add_dependencies(bitcoin_clientversion generate_build_info)
 
+add_subdirectory(univalue)
+
 #=============================
 # secp256k1 subtree
 #=============================

src/univalue/CMakeLists.txt

@@ -0,0 +1,15 @@
+# Copyright (c) 2023-present The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or https://opensource.org/license/mit/.
+
+add_library(univalue STATIC EXCLUDE_FROM_ALL
+  lib/univalue.cpp
+  lib/univalue_get.cpp
+  lib/univalue_read.cpp
+  lib/univalue_write.cpp
+)
+target_include_directories(univalue
+  PUBLIC
+    $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
+)
+target_link_libraries(univalue PRIVATE core_interface)