proper CMake finding and using of libunbound

CMakeLists.txt

@@ -226,20 +226,23 @@ endif()
 string(REGEX REPLACE "^fatal.*$" nogit GIT_VERSION_REAL "${GIT_VERSION}")
 
 
-find_package(PkgConfig QUIET)
-if(PKG_CONFIG_FOUND)
-    pkg_check_modules(SD libsystemd)
-    # Default WITH_SYSTEMD to true if we found it
-    option(WITH_SYSTEMD "enable systemd integration for sd_notify" ${SD_FOUND})
-
-    if(WITH_SYSTEMD)
-      if(NOT SD_FOUND)
-        message(FATAL_ERROR "libsystemd not found")
-      endif()
-      add_definitions(-DWITH_SYSTEMD)
-      include_directories(${SD_INCLUDE_DIRS})
-      set(SD_LIBS ${SD_LDFLAGS})
-    endif()
+find_package(PkgConfig REQUIRED)
+
+pkg_check_modules(UNBOUND libunbound REQUIRED IMPORTED_TARGET)
+
+add_library(libunbound INTERFACE)
+
+pkg_check_modules(SD libsystemd)
+# Default WITH_SYSTEMD to true if we found it
+option(WITH_SYSTEMD "enable systemd integration for sd_notify" ${SD_FOUND})
+
+if(WITH_SYSTEMD)
+  if(NOT SD_FOUND)
+    message(FATAL_ERROR "libsystemd not found")
+  endif()
+  add_definitions(-DWITH_SYSTEMD)
+  include_directories(${SD_INCLUDE_DIRS})
+  set(SD_LIBS ${SD_LDFLAGS})
 endif()
 
 option(SUBMODULE_CHECK "Enables checking that vendored library submodules are up to date" ON)

llarp/CMakeLists.txt

@@ -221,7 +221,9 @@ if(WITH_HIVE)
   target_sources(liblokinet PRIVATE tooling/router_hive.cpp)
 endif()
 
-target_link_libraries(liblokinet PUBLIC cxxopts unbound abyss lokinet-platform lokinet-util lokinet-cryptography)
+target_link_libraries(liblokinet PUBLIC cxxopts abyss lokinet-platform lokinet-util lokinet-cryptography)
+
+target_link_libraries(liblokinet PRIVATE PkgConfig::UNBOUND)
 
 if(BUILD_SHARED_LIBS)
   install(TARGETS lokinet-util lokinet-platform liblokinet LIBRARY DESTINATION lib)