CMake: use platform dependent name for dlopen() library

Closes #4279

diff --git a/CMakeLists.txt b/CMakeLists.txt
index af367e5226f2bff736cc11426a01d8719cafabbb..0772d6e512bd144dfa867c7e0db84c8d9bc100b1 100644 (file)
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -260,7 +260,7 @@ if(ENABLE_THREADED_RESOLVER)
 endif()
 
 # Check for all needed libraries
-check_library_exists_concat("dl"     dlopen       HAVE_LIBDL)
+check_library_exists_concat("${CMAKE_DL_LIBS}" dlopen HAVE_LIBDL)
 check_library_exists_concat("socket" connect      HAVE_LIBSOCKET)
 check_library_exists("c" gethostbyname "" NOT_NEED_LIBNSL)