Index: Mk/bsd.options.mk
===================================================================
--- Mk/bsd.options.mk
+++ Mk/bsd.options.mk
@@ -475,12 +475,11 @@
 .      endfor
 .    endif
 .    if defined(${opt}_VARS)
-.      for var in ${${opt}_VARS}
-_u=		${var:C/=.*//}
-.        if ${_u:M*+}
-${_u:C/.$//:tu}+=	${var:C/[^+]*\+=//:C/^"(.*)"$$/\1/}
+.      for var in ${${opt}_VARS:C/=.*//:O:u}
+.        if ${var:M*+}
+${var:C/.$//:tu}+=	${${opt}_VARS:M${var}=*:C/[^+]*\+=//:C/^"(.*)"$$/\1/}
 .        else
-${_u:tu}=	${var:C/[^=]*=//:C/^"(.*)"$$/\1/}
+${var:tu}=		${${opt}_VARS:M${var}=*:[-1]:C/[^=]*=//:C/^"(.*)"$$/\1/}
 .        endif
 .      endfor
 .    endif