Our gperf (2.7.2) doesn't understand --output-file.

--- camel/providers/imapx/Makefile.in.orig	2010-04-26 14:33:56.000000000 +0200
+++ camel/providers/imapx/Makefile.in	2010-04-26 14:35:10.000000000 +0200
@@ -914,7 +914,7 @@ uninstall-am: uninstall-camel_providerDA
 
 
 camel-imapx-tokenise.h: camel-imapx-tokens.txt
-	@GPERF@ -H imapx_hash -N imapx_tokenise_struct -L ANSI-C -o -t -k1,$$ $< --output-file=$@
+	@GPERF@ -H imapx_hash -N imapx_tokenise_struct -L ANSI-C -o -t -k1,$$ $< > $@
 
 -include $(top_srcdir)/git.mk