diff --git a/CMakeLists.txt b/CMakeLists.txt
index bb62bb4..f904b49 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -116,10 +116,16 @@
 # Generate config.h
 include(CheckIncludeFiles)
 include(CheckFunctionExists)
-set(CMAKE_EXTRA_INCLUDE_FILES winsock2.h)
-set(CMAKE_REQUIRED_LIBRARIES ws2_32)
+include(CheckTypeSize)
+if(WIN32)
+  set(CMAKE_EXTRA_INCLUDE_FILES winsock2.h)
+  set(CMAKE_REQUIRED_LIBRARIES ws2_32)
+endif()
 check_function_exists(inet_aton HAVE_INET_ATON)
 check_function_exists(inet_ntop HAVE_INET_NTOP)
+set(CMAKE_EXTRA_INCLUDE_FILES sys/socket.h)
+check_type_size(socklen_t SOCKLEN_T)
+
 set(CMAKE_EXTRA_INCLUDE_FILES) 
 set(CMAKE_REQUIRED_LIBRARIES)
 check_function_exists(snprintf HAVE_SNPRINTF)
diff --git a/config.h.cmake.in b/config.h.cmake.in
index fef3649..54f6035 100644
--- a/config.h.cmake.in
+++ b/config.h.cmake.in
@@ -1,3 +1,4 @@
+#cmakedefine HAVE_SOCKLEN_T
 #cmakedefine HAVE_INET_ATON
 #cmakedefine HAVE_INET_NTOP
 #cmakedefine HAVE_SNPRINTF