cmake: add <pthread.h> into CMAKE_REQUIRED_INCLUDES for sizeof(pthread_t)

Fixes: #475

diff --git a/CMakeLists.txt b/CMakeLists.txt
index ae6178b128a5e5a3b6f27331a083e88728121aa5..343bf5f73959c75464ccc6da12253746432d5d9c 100644 (file)
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -471,6 +471,7 @@ else()
 endif()
 
 if (NOT EVENT__DISABLE_THREAD_SUPPORT)
+    list(APPEND CMAKE_EXTRA_INCLUDE_FILES pthread.h)
     CHECK_TYPE_SIZE(pthread_t EVENT__SIZEOF_PTHREAD_T)
 endif()