diff --git a/Makefile.rules b/Makefile.rules
index 6abd3934c7b..2f566eeb923 100644
--- a/Makefile.rules
+++ b/Makefile.rules
@@ -583,16 +583,24 @@ ifeq ($(HOST_OS),Darwin)
 
   LoadableModuleOptions := -Wl,-flat_namespace -Wl,-undefined,suppress
   SharedLinkOptions := -dynamiclib
-  ifneq ($(ARCH),ARM)
-    SharedLinkOptions += -mmacosx-version-min=$(DARWIN_VERSION)
+  ifdef DEPLOYMENT_TARGET
+    SharedLinkOptions += $(DEPLOYMENT_TARGET)
+  else
+    ifneq ($(ARCH),ARM)
+      SharedLinkOptions += -mmacosx-version-min=$(DARWIN_VERSION)
+    endif
   endif
 else
   SharedLinkOptions=-shared
 endif
 
 ifeq ($(TARGET_OS),Darwin)
-  ifneq ($(ARCH),ARM)
-    TargetCommonOpts += -mmacosx-version-min=$(DARWIN_VERSION)
+  ifdef DEPLOYMENT_TARGET
+    TargetCommonOpts += $(DEPLOYMENT_TARGET)
+  else
+    ifneq ($(ARCH),ARM)
+      TargetCommonOpts += -mmacosx-version-min=$(DARWIN_VERSION)
+    endif
   endif
 endif
 
diff --git a/projects/sample/Makefile.llvm.rules b/projects/sample/Makefile.llvm.rules
index 5d674612857..30f54c45e20 100644
--- a/projects/sample/Makefile.llvm.rules
+++ b/projects/sample/Makefile.llvm.rules
@@ -501,16 +501,24 @@ ifeq ($(HOST_OS),Darwin)
 
   LoadableModuleOptions := -Wl,-flat_namespace -Wl,-undefined,suppress
   SharedLinkOptions := -dynamiclib
-  ifneq ($(ARCH),ARM)
-    SharedLinkOptions += -mmacosx-version-min=$(DARWIN_VERSION)
+  ifdef DEPLOYMENT_TARGET
+    SharedLinkOptions += $(DEPLOYMENT_TARGET)
+  else
+    ifneq ($(ARCH),ARM)
+      SharedLinkOptions += -mmacosx-version-min=$(DARWIN_VERSION)
+    endif
   endif
 else
   SharedLinkOptions=-shared
 endif
 
 ifeq ($(TARGET_OS),Darwin)
-  ifneq ($(ARCH),ARM)
-    TargetCommonOpts += -mmacosx-version-min=$(DARWIN_VERSION)
+  ifdef DEPLOYMENT_TARGET
+    TargetCommonOpts += $(DEPLOYMENT_TARGET)
+  else
+    ifneq ($(ARCH),ARM)
+      TargetCommonOpts += -mmacosx-version-min=$(DARWIN_VERSION)
+    endif
   endif
 endif
 
diff --git a/utils/buildit/build_llvm b/utils/buildit/build_llvm
index c7777f83383..896ede3e466 100755
--- a/utils/buildit/build_llvm
+++ b/utils/buildit/build_llvm
@@ -154,6 +154,11 @@ if [ "$ARM_HOSTED_BUILD" = yes ]; then
     --program-prefix="" \
     || exit 1
 
+  if [ -n "$IPHONEOS_DEPLOYMENT_TARGET" ]; then
+    COMMON_MAKEFLAGS="$COMMON_MAKEFLAGS \
+      DEPLOYMENT_TARGET=-mios-version-min=$IPHONEOS_DEPLOYMENT_TARGET"
+  fi
+
   make $JOBS_FLAG $COMMON_MAKEFLAGS SDKROOT= UNIVERSAL_ARCH="$HOSTS" \
     CXXFLAGS="-DLLVM_VERSION_INFO='\" Apple Build #$LLVM_VERSION\"'"
   if [ $? != 0 ] ; then
@@ -171,8 +176,16 @@ else
     # Use a non-standard "darwin_sim" host triple to trigger a cross-build.
     configure_opts="--enable-targets=x86 --host=i686-apple-darwin_sim \
                     --build=i686-apple-darwin10"
+    if [ -n "$IPHONEOS_DEPLOYMENT_TARGET" ]; then
+      COMMON_MAKEFLAGS="$COMMON_MAKEFLAGS \
+        DEPLOYMENT_TARGET=-mios-simulator-version-min=$IPHONEOS_DEPLOYMENT_TARGET"
+    fi
   else
     configure_opts="--enable-targets=arm,x86"
+    if [ -n "$MACOSX_DEPLOYMENT_TARGET" ]; then
+      COMMON_MAKEFLAGS="$COMMON_MAKEFLAGS \
+        DEPLOYMENT_TARGET=-mmacosx-version-min=$MACOSX_DEPLOYMENT_TARGET"
+    fi
   fi
 
   if [ $SDKROOT ]; then