Don't use -Wl,-syslibroot when building against more current SDKs

solenv/gbuild/platform/macosx.mk

@@ -95,7 +95,7 @@ gb_OBJCXXFLAGS := -x objective-c++ -fobjc-exceptions
 gb_OBJCFLAGS := -x objective-c -fobjc-exceptions
 
 gb_LinkTarget_LDFLAGS := \
-	-Wl,-syslibroot,$(gb_SDKDIR) \
+	$(if $(filter 1040 1050,$(MAC_OS_X_VERSION_MIN_REQUIRED)),-Wl$(COMMA)-syslibroot$(COMMA)$(gb_SDKDIR)) \
 	$(subst -L../lib , ,$(SOLARLIB)) \
 #man ld says: obsolete	-Wl,-multiply_defined,suppress \
 

solenv/inc/unxmacx.mk

@@ -178,8 +178,12 @@ LINK*=$(CXX)
 LINKC*=$(CC)
 
 LINKFLAGSDEFS*=-Wl,-multiply_defined,suppress
+
+.IF "$(MAC_OS_X_VERSION_MIN_REQUIRED)" <= "1050"
 # assure backwards-compatibility
 EXTRA_LINKFLAGS*:=-Wl,-syslibroot,$(MACOSX_SDK_PATH)
+.ENDIF
+
 # Very long install_names are needed so that install_name_tool -change later on
 # does not complain that "larger updated load commands do not fit:"
 LINKFLAGSRUNPATH_URELIB=-install_name '@__________________________________________________URELIB/$(@:f)'