orcaslicer vendors a *customized* Clipper2 (a bespoke clipper2_z.hpp "Hackish
wrapper ... to compile Clipper2 with Z support" that the slicer includes
directly), so it cannot be built against the system sci-mathematics/clipper2.
deps_src/clipper2 otherwise builds shared (the slicer's global BUILD_SHARED_LIBS
overrides its local option), and the resulting libClipper2.so is linked but not
installed -- after the install-time rpath strip it would resolve against the
system clipper2, an ABI-skew hazard. Force the vendored copy STATIC so it is
baked into orca-slicer instead (no runtime .so, no system clipper2 dependency).

--- a/deps_src/clipper2/CMakeLists.txt
+++ b/deps_src/clipper2/CMakeLists.txt
@@ -30,7 +30,7 @@
 )

 # 2d version of Clipper2
-add_library(Clipper2 ${CLIPPER2_INC} ${CLIPPER2_SRC})
+add_library(Clipper2 STATIC ${CLIPPER2_INC} ${CLIPPER2_SRC})

 target_include_directories(Clipper2
   PUBLIC Clipper2Lib/include