Build fix when boost is not in prefix/boost

src/libslic3r/CMakeLists.txt

@@ -182,13 +182,12 @@ if (SLIC3R_PCH AND NOT SLIC3R_SYNTAXONLY)
 endif ()
 
 target_compile_definitions(libslic3r PUBLIC -DUSE_TBB)
-target_include_directories(libslic3r SYSTEM PUBLIC ${Boost_INCLUDE_DIRS})
 target_include_directories(libslic3r PRIVATE ${CMAKE_CURRENT_SOURCE_DIR} ${LIBNEST2D_INCLUDES} PUBLIC ${CMAKE_CURRENT_BINARY_DIR})
 target_link_libraries(libslic3r
     libnest2d
     admesh
     miniz
-    ${Boost_LIBRARIES}
+    boost_libs
     clipper
     nowide
     ${EXPAT_LIBRARIES}