diff --git a/src/Native/Unix/configure.cmake b/src/Native/Unix/configure.cmake

index f4a30ad6cb..f2db68402a 100644

--- a/src/Native/Unix/configure.cmake

+++ b/src/Native/Unix/configure.cmake

@@ -27,6 +27,12 @@ else ()

     message(FATAL_ERROR "Unknown platform.  Cannot define PAL_UNIX_NAME, used by RuntimeInformation.")

 endif ()

+

+set (PREVIOUS_CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS})

+set (CMAKE_CXX_FLAGS "-D_GNU_SOURCE")

+set (PREVIOUS_CMAKE_C_FLAGS ${CMAKE_C_FLAGS})

+set (CMAKE_C_FLAGS "-D_GNU_SOURCE")

+

 # We compile with -Werror, so we need to make sure these code fragments compile without warnings.

 # Older CMake versions (3.8) do not assign the result of their tests, causing unused-value errors

 # which are not distinguished from the test failing. So no error for that one.

@@ -698,6 +704,9 @@ endif()

 set (CMAKE_REQUIRED_LIBRARIES)

+set (CMAKE_CXX_FLAGS "${PREVIOUS_CMAKE_CXX_FLAGS}")

+set (CMAKE_C_FLAGS "${PREVIOUS_CMAKE_C_FLAGS}")

+

 check_c_source_compiles(

     "

     #include <sys/inotify.h>