+ifeq ($(OS),Darwin)
+ DARWIN_VERSION := `sw_vers -productVersion`
+ # Strip a number like 10.4.7 to 10.4
+ DARWIN_VERSION := $(shell echo $(DARWIN_VERSION)| sed -E 's/(10.[0-9]).*/\1/')
+ # Get "4" out of 10.4 for later pieces in the makefile.
+ DARWIN_MAJVERS := $(shell echo $(DARWIN_VERSION)| sed -E 's/10.([0-9]).*/\1/')
+
+ SharedLinkOptions=-Wl,-flat_namespace -Wl,-undefined -Wl,suppress \
+ -dynamiclib -mmacosx-version-min=$(DARWIN_VERSION)
+ TargetCommonOpts += -mmacosx-version-min=$(DARWIN_VERSION)
+else
+ ifeq ($(OS),Cygwin)
+ SharedLinkOptions=-shared -nostdlib -Wl,--export-all-symbols \
+ -Wl,--enable-auto-import -Wl,--enable-auto-image-base \
+ -Wl,--enable-runtime-pseudo-relocs
+ else
+ SharedLinkOptions=-shared
+ endif
+endif
+