diff --git a/common/math.mk b/common/math.mk
index ec15f88ee0..0271ea8b03 100644
--- a/common/math.mk
+++ b/common/math.mk
@@ -121,14 +121,26 @@ $(strip $(call _math_check_valid,$(1)) $(call _math_check_valid,$(2)) \
   $(lastword $(filter $(1) $(2),$(__MATH_NUMBERS))))
 endef
 
+# Returns the lesser of $1 or $2.
+define math_min
+$(strip $(call _math_check_valid,$(1)) $(call _math_check_valid,$(2)) \
+  $(firstword $(filter $(1) $(2),$(__MATH_NUMBERS))))
+endef
+
 $(call math-expect-error,(call math_max),Argument missing)
 $(call math-expect-error,(call math_max,1),Argument missing)
 $(call math-expect-error,(call math_max,1 2,3),Multiple words in a single argument: 1 2)
+$(call math-expect-error,(call math_min,1,2 3),Multiple words in a single argument: 2 3)
 $(call math-expect,(call math_max,0,1),1)
 $(call math-expect,(call math_max,1,0),1)
 $(call math-expect,(call math_max,1,1),1)
 $(call math-expect,(call math_max,5,42),42)
 $(call math-expect,(call math_max,42,5),42)
+$(call math-expect,(call math_min,0,1),0)
+$(call math-expect,(call math_min,1,0),0)
+$(call math-expect,(call math_min,1,1),1)
+$(call math-expect,(call math_min,7,32),7)
+$(call math-expect,(call math_min,32,7),7)
 
 define math_gt_or_eq
 $(if $(filter $(1),$(call math_max,$(1),$(2))),true)
diff --git a/core/config.mk b/core/config.mk
index e24e957930..de0a06b608 100644
--- a/core/config.mk
+++ b/core/config.mk
@@ -753,13 +753,16 @@ else
 endif
 .KATI_READONLY := BOARD_CURRENT_API_LEVEL_FOR_VENDOR_MODULES
 
-min_systemsdk_version := $(firstword $(BOARD_API_LEVEL) $(BOARD_SHIPPING_API_LEVEL) $(PRODUCT_SHIPPING_API_LEVEL))
-ifneq (,$(min_systemsdk_version))
-ifneq ($(call numbers_less_than,$(min_systemsdk_version),$(BOARD_SYSTEMSDK_VERSIONS)),)
-  $(error BOARD_SYSTEMSDK_VERSIONS ($(BOARD_SYSTEMSDK_VERSIONS)) must all be greater than or equal to BOARD_API_LEVEL, BOARD_SHIPPING_API_LEVEL or PRODUCT_SHIPPING_API_LEVEL ($(min_systemsdk_version)))
-endif
-endif
 ifdef PRODUCT_SHIPPING_API_LEVEL
+  board_api_level := $(firstword $(BOARD_API_LEVEL) $(BOARD_SHIPPING_API_LEVEL))
+  ifneq (,$(board_api_level))
+    min_systemsdk_version := $(call math_min,$(board_api_level),$(PRODUCT_SHIPPING_API_LEVEL))
+  else
+    min_systemsdk_version := $(PRODUCT_SHIPPING_API_LEVEL)
+  endif
+  ifneq ($(call numbers_less_than,$(min_systemsdk_version),$(BOARD_SYSTEMSDK_VERSIONS)),)
+    $(error BOARD_SYSTEMSDK_VERSIONS ($(BOARD_SYSTEMSDK_VERSIONS)) must all be greater than or equal to BOARD_API_LEVEL, BOARD_SHIPPING_API_LEVEL or PRODUCT_SHIPPING_API_LEVEL ($(min_systemsdk_version)))
+  endif
   ifneq ($(call math_gt_or_eq,$(PRODUCT_SHIPPING_API_LEVEL),28),)
     ifneq ($(TARGET_IS_64_BIT), true)
       ifneq ($(TARGET_USES_64_BIT_BINDER), true)