--- src/posix.mak.orig	2019-09-02 04:43:46.000000000 +0900
+++ src/posix.mak	2019-10-07 09:04:28.000000000 +0900
@@ -99,10 +99,6 @@
 DSCANNER_HASH=b51ee472fe29c05cc33359ab8de52297899131fe
 DSCANNER_DIR=$G/dscanner-$(DSCANNER_HASH)
 
-ifeq (osx,$(OS))
-    export MACOSX_DEPLOYMENT_TARGET=10.9
-endif
-
 HOST_CXX=c++
 # compatibility with old behavior
 ifneq ($(HOST_CC),)