Address Python API CI build errors

library/python/CMakeLists.txt

@@ -28,22 +28,15 @@ endif ()
 # Load the wavemap library (if not already loaded)
 if (NOT TARGET wavemap::wavemap_core)
   if (EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/../cpp/)
-    message(STATUS "Loading wavemap library installed on system")
+    message(STATUS "Loading wavemap C++ library sources")
+    set(GENERATE_WAVEMAP_INSTALL_RULES OFF)  # We will use custom rules
     add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/../cpp
         ${CMAKE_CURRENT_BINARY_DIR}/wavemap)
   else ()
-    set(WAVEMAP_VERSION main)
-    message(STATUS
-        "Loading wavemap library from GitHub (ref ${WAVEMAP_VERSION})")
-    cmake_minimum_required(VERSION 3.18)
-    include(FetchContent)
-    FetchContent_Declare(
-        ext_wavemap PREFIX wavemap
-        GIT_REPOSITORY https://github.com/ethz-asl/wavemap.git
-        GIT_TAG ${WAVEMAP_VERSION}
-        GIT_SHALLOW 1
-        SOURCE_SUBDIR library/cpp)
-    FetchContent_MakeAvailable(ext_wavemap)
+    message(ERROR
+        "Can not load wavemap C++ library sources. Are you using an old "
+        "version of pip? If so, retry after upgrading with "
+        "\"python3 -m pip install --upgrade pip\".")
   endif ()
 endif ()
 
@@ -79,6 +72,9 @@ target_compile_options(_pywavemap_bindings PRIVATE
     -Wno-pedantic -Wno-unused-result -Wno-suggest-attribute=const)
 
 # Install directive for scikit-build-core
+install(TARGETS wavemap_core DESTINATION pywavemap)
+install(TARGETS wavemap_io DESTINATION pywavemap)
+install(TARGETS wavemap_pipeline DESTINATION pywavemap)
 install(TARGETS _pywavemap_bindings LIBRARY DESTINATION pywavemap)
 
 # Generate stubs