--- CMakeLists.txt.orig	2019-11-25 13:40:31 UTC
+++ CMakeLists.txt
@@ -207,7 +207,7 @@ target_include_directories(dmlc PUBLIC
   $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
   $<INSTALL_INTERFACE:${CMAKE_INSTALL_PREFIX}/include>)
 target_compile_definitions(dmlc PRIVATE -D_XOPEN_SOURCE=700
-  -D_POSIX_SOURCE -D_POSIX_C_SOURCE=200809L -D_DARWIN_C_SOURCE
+  -D_DARWIN_C_SOURCE
   -DDMLC_CORE_USE_CMAKE)
 # DMLC_CORE_USE_CMAKE macro constant indicates the use of CMake
 
