diff --git a/src/build/Common.gmake b/src/build/Common.gmake
index f6bc3dc7991022fa0479a62a0666c7818f0c1a3a..00e6298ffc2ad0cb70d38cc2b65124121c2928b2 100644
--- a/src/build/Common.gmake
+++ b/src/build/Common.gmake
@@ -328,7 +328,7 @@ ifeq ($(os),haiku)
  CFLAGS	+=	-D__unix__ -DNEEDS_FORKPTY
 endif
 ifeq ($(os),darwin)
- MIN_MAC_OSX_VERSION = 10.6
+ MIN_MAC_OSX_VERSION ?= 10.6
  CFLAGS +=  -D__unix__ -fno-common -D__DARWIN__
  CFLAGS +=  -mmacosx-version-min=$(MIN_MAC_OSX_VERSION)
  LDFLAGS += -mmacosx-version-min=$(MIN_MAC_OSX_VERSION)