diff --git a/CMakeLists.txt b/CMakeLists.txt
index 94bd08fa..6a7b8377 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -33,14 +33,15 @@ xo_toplevel_compile_options()
 
 add_subdirectory(utest)
 
-set(SELF_LIB xo_ordinaltree)
+# ----------------------------------------------------------------
+# header-only library
 
-add_library(${SELF_LIB} INTERFACE)
-xo_include_headeronly_options2(${SELF_LIB})
+set(SELF_LIB ordinaltree)
+xo_add_headeronly_library(${SELF_LIB})
 
 # ----------------------------------------------------------------
 #
-xo_install_library2(${PROJECT_NAME})
+xo_install_library3(${SELF_LIB} ${PROJECT_NAME}Targets)
 xo_install_include_tree()
 # (note: ..Targets from xo_install_library2())
 xo_export_cmake_config(${PROJECT_NAME} ${PROJECT_VERSION} ${PROJECT_NAME}Targets)
diff --git a/utest/CMakeLists.txt b/utest/CMakeLists.txt
index 26b370b4..30311ce5 100644
--- a/utest/CMakeLists.txt
+++ b/utest/CMakeLists.txt
@@ -1,4 +1,4 @@
-# tree/utest/CMakeLists.txt
+# ordinaltree/utest/CMakeLists.txt
 
 # note: tests in this directory use Catch2-provided main
 set(SELF_EXE utest.tree)
@@ -22,26 +22,4 @@ xo_dependency(${SELF_EXE} randomgen)
 
 xo_external_target_dependency(${SELF_EXE} Catch2 Catch2::Catch2)
 
-# need this so that catch2/include appears in compile_commands.json,
-# on which lsp integration relies.
-#
-# See also /nix/store/*-catch2-*/lib/cmake/Catch2/ParseAndAddCatchTests.cmake;
-# commands here derived from ^ .cmake file
-#
-
-# let's see if xo_external_target_dependency() works for these..
-#find_path(CATCH_INCLUDE_DIR "catch2/catch.hpp")
-#target_include_directories(${SELF_UTEST_NAME} PUBLIC ${CATCH_INCLUDE_DIR})
-
-## ----------------------------------------------------------------
-## make standard directories for std:: includes explicit
-## so that
-## (1) they appear in compile_commands.json.
-## (2) clangd (run from emacs lsp-mode) can find them
-##
-#if(CMAKE_EXPORT_COMPILE_COMMANDS)
-#  set(CMAKE_CXX_STANDARD_INCLUDE_DIRECTORIES
-#      ${CMAKE_CXX_IMPLICIT_INCLUDE_DIRECTORIES})
-#endif()
-
-# end tree/utest/CMakeLists.txt
+# end ordinaltree/utest/CMakeLists.txt