Do not use _POSIX_C_SOURCE on Darwin

diff --git a/src/pal/src/configure.cmake b/src/pal/src/configure.cmake
index a067ee0..206801c 100644 (file)
--- a/src/pal/src/configure.cmake
+++ b/src/pal/src/configure.cmake
@@ -6,7 +6,9 @@ include(CheckIncludeFiles)
 include(CheckStructHasMember)
 include(CheckTypeSize)
 
-set(CMAKE_REQUIRED_DEFINITIONS "-D_DEFAULT_SOURCE -D_POSIX_C_SOURCE=200809L")
+if(NOT CMAKE_SYSTEM_NAME STREQUAL Darwin)
+  set(CMAKE_REQUIRED_DEFINITIONS "-D_DEFAULT_SOURCE -D_POSIX_C_SOURCE=200809L")
+endif()
 check_include_files(ieeefp.h HAVE_IEEEFP_H)
 check_include_files(alloca.h HAVE_ALLOCA_H)
 check_include_files(sys/vmparam.h HAVE_SYS_VMPARAM_H)