configure: Apply makedep flags when doing automatic dependencies.
diff --git a/configure.ac b/configure.ac
index 23cf7fe..e07de2b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1978,7 +1978,7 @@
 .BEGIN: Makefile
 .MAKEFILEDEPS:
 Makefile: dummy
-	-\$(MAKEDEP) -C\$(SRCDIR) -S\$(TOPSRCDIR) -T\$(TOPOBJDIR) \$(EXTRAINCL) \$(DEPEND_SRCS)
+	-\$(MAKEDEP) \$(MAKEDEPFLAGS) -C\$(SRCDIR) -S\$(TOPSRCDIR) -T\$(TOPOBJDIR) \$(EXTRAINCL) \$(DEPEND_SRCS)
 
 \$(OBJS) \$(C_SRCS16:.c=.o): \$(IDL_GEN_HEADERS)
 \$(IDL_GEN_C_SRCS:.c=.o): \$(IDL_GEN_C_SRCS)