The Catch2::Catch2 target needs to be added to find the catch2 headers.

--- test/__inline_var_tests/CMakeLists.txt.orig	2026-01-13 16:46:26 UTC
+++ test/__inline_var_tests/CMakeLists.txt
@@ -7,5 +7,5 @@ add_dependencies(tests inline_var_tests)
 file(GLOB_RECURSE inline_var_test_files "*.cpp")
 add_executable(inline_var_tests EXCLUDE_FROM_ALL ${inline_var_test_files})
 add_dependencies(tests inline_var_tests)
-target_link_libraries(inline_var_tests PUBLIC zug-dev)
+target_link_libraries(inline_var_tests PUBLIC zug-dev Catch2::Catch2)
 add_test("test/inline_var_tests" inline_var_tests)