Try another fix

example/CMakeLists.txt

@@ -23,7 +23,6 @@ if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -pthread -Werror -Wall -Wextra -Weffc++ -Wswitch-default")
 elseif (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Werror -Wall -Wextra -Weffc++ -Wswitch-default -Wfloat-equal -Wimplicit-fallthrough -Weverything")
-    set(CMAKE_LINK_FLAGS "${CMAKE_LINK_FLAGS} -lpthread")
 elseif ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC")
     add_definitions(-D_CRT_SECURE_NO_WARNINGS=1)
 endif()
@@ -32,4 +31,8 @@ foreach (example ${EXAMPLES})
     add_executable(${example} ${example}/${example}.cpp)
 endforeach()
 
+if (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
+    target_link_libraries(parsebyparts pthread)
+endif()
+
 add_custom_target(examples ALL DEPENDS ${EXAMPLES})