diff -Naur fluent-bit.old/cmake/luajit.cmake fluent-bit.new/cmake/luajit.cmake
--- fluent-bit.old/cmake/luajit.cmake
+++ fluent-bit.new/cmake/luajit.cmake
@@ -11,10 +11,6 @@
 set(LUAJIT_SRC ${CMAKE_CURRENT_SOURCE_DIR}/${FLB_PATH_LIB_LUAJIT})
 set(LUAJIT_DEST ${CMAKE_CURRENT_BINARY_DIR})
 
-if (CMAKE_SYSTEM_NAME MATCHES "Darwin")
-  set(CFLAGS "${CFLAGS} -isysroot ${CMAKE_OSX_SYSROOT}")
-endif()
-
 # luajit (UNIX)
 # =============
 ExternalProject_Add(luajit