makefiles: Add rules for cross-compiling static libraries.
diff --git a/Make.rules.in b/Make.rules.in
index 05e82bd..057d9b8 100644
--- a/Make.rules.in
+++ b/Make.rules.in
@@ -53,6 +53,9 @@
 RSVG      = @RSVG@
 ICOTOOL   = @ICOTOOL@
 CROSSCC   = @CROSSCC@
+CROSSTARGET = @CROSSTARGET@
+CROSSAR     = $(CROSSTARGET)-ar
+CROSSRANLIB = $(CROSSTARGET)-ranlib
 FAKEEXT   = $(DLLEXT:.so=.fake)
 INCLUDES     = -I$(SRCDIR) -I. -I$(TOPSRCDIR)/include -I$(TOPOBJDIR)/include $(EXTRAINCL)
 EXTRACFLAGS  = @EXTRACFLAGS@