Imported from gentoo:
http://sources.gentoo.org/cgi-bin/viewvc.cgi/gentoo-x86/net-print/libgnomecups/files/libgnomecups-0.2.3-cups-1.6.patch

From ae783efde4fa69578651994505462f02b8639220 Mon Sep 17 00:00:00 2001
From: Alexandre Rostovtsev <tetromino@gentoo.org>
Date: Tue, 7 Aug 2012 06:53:09 -0400
Subject: [PATCH] Use CUPS-1.6 IPP API getter/setter functions

CUPS 1.6 makes various structures private and introduces these ippGet
and ippSet functions for all of the fields in these structures.
http://www.cups.org/str.php?L3928

We define our own accessors when building against CUPS < 1.6.

Based on work by Jiri Popelka <jpopelka@redhat.com> at
https://bugzilla.gnome.org/show_bug.cgi?id=679759
---
 libgnomecups/gnome-cups-printer.c |   48 +++++++++++++++++++++++++++++-------
 libgnomecups/gnome-cups-queue.c   |   43 +++++++++++++++++++++++++++------
 libgnomecups/gnome-cups-request.c |   44 ++++++++++++++++++++++++++++-----
 3 files changed, 110 insertions(+), 25 deletions(-)

diff --git a/libgnomecups/gnome-cups-printer.c b/libgnomecups/gnome-cups-printer.c
index c924af0..f5e1ef7 100644
--- a/libgnomecups/gnome-cups-printer.c
+++ b/libgnomecups/gnome-cups-printer.c
@@ -37,6 +37,34 @@
 
 #define UPDATE_TIMEOUT 5000
 
+#if (CUPS_VERSION_MAJOR > 1) || (CUPS_VERSION_MINOR > 5)
+#define HAVE_CUPS_1_6 1
+#endif
+
+#ifndef HAVE_CUPS_1_6
+#define ippGetCount(attr)     attr->num_values
+#define ippGetName(attr)      attr->name
+#define ippGetInteger(attr, element) attr->values[element].integer
+#define ippGetString(attr, element, language) attr->values[element].string.text
+
+static ipp_attribute_t *
+ippFirstAttribute(ipp_t *ipp)
+{
+  if (!ipp)
+    return (NULL);
+  return (ipp->current = ipp->attrs);
+}
+
+static ipp_attribute_t *
+ippNextAttribute(ipp_t *ipp)
+{
+  if (!ipp || !ipp->current)
+    return (NULL);
+  return (ipp->current = ipp->current->next);
+}
+#endif
+
+
 struct _GnomeCupsPPDFile {
 	char name[1];
 };
@@ -173,9 +201,9 @@ map_reasons (GnomeCupsPrinter *printer,
 	printer->details->state_reasons = NULL;
 
 	/* cf. RFC2911 4.4.12 */
-	for (i = 0; i < attr->num_values; i++) {
+	for (i = 0; i < ippGetCount (attr); i++) {
 		const char *p;
-		const char *keyword = attr->values [i].string.text;
+		const char *keyword = ippGetString (attr, i, NULL);
 
 		reason = g_new (GnomeCupsPrinterReason, 1);
 
@@ -224,8 +252,8 @@ gnome_cups_printer_get_info (GnomeCupsPrinter *printer)
 	return printer->details->info;
 }
 
-#define MAP_INT(v,a) {if (!g_ascii_strcasecmp (attr->name, (a))) { if ((v) != attr->values[0].integer) { changed = TRUE; } (v) = attr->values[0].integer; }}
-#define MAP_STRING(v,a) {if (!g_ascii_strcasecmp (attr->name, (a))) { if (!v || strcmp (v, attr->values[0].string.text)) { g_free (v); changed = TRUE; (v) = g_strdup (attr->values[0].string.text); }}}
+#define MAP_INT(v,a) {if (!g_ascii_strcasecmp (ippGetName (attr), (a))) { if ((v) != ippGetInteger (attr, 0)) { changed = TRUE; } (v) = ippGetInteger (attr, 0); }}
+#define MAP_STRING(v,a) {if (!g_ascii_strcasecmp (ippGetName (attr), (a))) { if (!v || strcmp (v, ippGetString (attr, 0, NULL))) { g_free (v); changed = TRUE; (v) = g_strdup (ippGetString (attr, 0, NULL)); }}}
 
 static void
 attributes_update_cb (guint id,
@@ -243,14 +271,14 @@ attributes_update_cb (guint id,
 	changed = FALSE;
 
 	if (!error && response) {
-		for (attr = response->attrs; attr != NULL; attr = attr->next) {
-			if (!attr->name) {
+		for (attr = ippFirstAttribute (response); attr != NULL; attr = ippNextAttribute (response)) {
+			if (!ippGetName (attr)) {
 				continue;
 			} 
-			if (!g_ascii_strcasecmp (attr->name, "attributes-charset") || !strcmp (attr->name, "attributes-charset")) {
+			if (!g_ascii_strcasecmp (ippGetName (attr), "attributes-charset") || !strcmp (ippGetName (attr), "attributes-charset")) {
 				continue;
 			}
-			if (!g_ascii_strcasecmp (attr->name, "printer-state-reasons")) {
+			if (!g_ascii_strcasecmp (ippGetName (attr), "printer-state-reasons")) {
 				map_reasons (printer, attr);
 			}
 			MAP_INT (printer->details->state, "printer-state");
@@ -570,7 +598,7 @@ get_default (void)
 	
 	attr = ippFindAttribute (response, "printer-name", IPP_TAG_NAME);
 	if (attr) {
-		name = g_strdup (attr->values[0].string.text);
+		name = g_strdup (ippGetString (attr, 0, NULL));
 	} else {
 		name = NULL;
 	}
@@ -698,7 +726,7 @@ get_printer_names (void)
 	attr = ippFindAttribute (response, "printer-name", IPP_TAG_NAME);
 	while (attr) {
 		ret = g_list_prepend (ret, 
-				      g_strdup (attr->values[0].string.text));
+				      g_strdup (ippGetString (attr, 0, NULL)));
 		
 		attr = ippFindNextAttribute (response, 
 					     "printer-name", 
diff --git a/libgnomecups/gnome-cups-queue.c b/libgnomecups/gnome-cups-queue.c
index 9f98ed9..298db42 100644
--- a/libgnomecups/gnome-cups-queue.c
+++ b/libgnomecups/gnome-cups-queue.c
@@ -15,6 +15,33 @@
 
 #define UPDATE_TIMEOUT 3000
 
+#if (CUPS_VERSION_MAJOR > 1) || (CUPS_VERSION_MINOR > 5)
+#define HAVE_CUPS_1_6 1
+#endif
+
+#ifndef HAVE_CUPS_1_6
+#define ippGetName(attr)      attr->name
+#define ippGetInteger(attr, element) attr->values[element].integer
+#define ippGetString(attr, element, language) attr->values[element].string.text
+
+static ipp_attribute_t *
+ippFirstAttribute(ipp_t *ipp)
+{
+  if (!ipp)
+    return (NULL);
+  return (ipp->current = ipp->attrs);
+}
+
+static ipp_attribute_t *
+ippNextAttribute(ipp_t *ipp)
+{
+  if (!ipp || !ipp->current)
+    return (NULL);
+  return (ipp->current = ipp->current->next);
+}
+#endif
+
+
 struct _GnomeCupsQueueDetails {
 	char *queue_name;
 	GList *jobs;
@@ -199,8 +226,8 @@ finish_job (GnomeCupsJob *job)
 	job->size = job->size * 1024;
 }
 
-#define MAP_STR(dest, src) { if (!g_ascii_strcasecmp (attr->name, (src))) { if ((dest) != NULL) g_free (dest); (dest) = g_strdup (attr->values[0].string.text);}}
-#define MAP_INT(dest, src) { if (!g_ascii_strcasecmp (attr->name, (src))) { (dest) = attr->values[0].integer; } }
+#define MAP_STR(dest, src) { if (!g_ascii_strcasecmp (ippGetName (attr), (src))) { if ((dest) != NULL) g_free (dest); (dest) = g_strdup (ippGetString (attr, 0, NULL));}}
+#define MAP_INT(dest, src) { if (!g_ascii_strcasecmp (ippGetName (attr), (src))) { (dest) = ippGetInteger (attr, 0); } }
 
 static void
 get_jobs_cb (guint id,
@@ -231,8 +258,8 @@ get_jobs_cb (guint id,
 	
 	if (response) {
 		job = g_new0 (GnomeCupsJob, 1);
-		for (attr = response->attrs; attr != NULL; attr = attr->next) {
-			if (attr->name == NULL) {
+		for (attr = ippFirstAttribute (response); attr != NULL; attr = ippNextAttribute (response)) {
+			if (ippGetName (attr) == NULL) {
 				if (job->name) {
 					finish_job (job);
 					jobs = g_list_prepend (jobs, job);	
@@ -244,7 +271,7 @@ get_jobs_cb (guint id,
 				continue;
 			}
 			
-			if (!g_ascii_strcasecmp (attr->name, "attributes-charset") || !g_ascii_strcasecmp (attr->name, "attributes-charset")) {
+			if (!g_ascii_strcasecmp (ippGetName (attr), "attributes-charset") || !g_ascii_strcasecmp (ippGetName (attr), "attributes-charset")) {
 				continue;
 				
 			}
@@ -355,8 +382,8 @@ gnome_cups_queue_get_job_nocache (GnomeCupsQueue *queue,
 
 	if (response) {
 		job = g_new0 (GnomeCupsJob, 1);
-		for (attr = response->attrs; attr != NULL; attr = attr->next) {
-			if (attr->name == NULL) {
+		for (attr = ippFirstAttribute (response); attr != NULL; attr = ippNextAttribute (response)) {
+			if (ippGetName (attr) == NULL) {
 				if (job->name) {
 					finish_job (job);
 				} else {
@@ -366,7 +393,7 @@ gnome_cups_queue_get_job_nocache (GnomeCupsQueue *queue,
 				break;
 			}
 			
-			if (!g_ascii_strcasecmp (attr->name, "attributes-charset") || !g_ascii_strcasecmp (attr->name, "attributes-charset")) {
+			if (!g_ascii_strcasecmp (ippGetName (attr), "attributes-charset") || !g_ascii_strcasecmp (ippGetName (attr), "attributes-charset")) {
 				continue;
 			}
 			
diff --git a/libgnomecups/gnome-cups-request.c b/libgnomecups/gnome-cups-request.c
index c94f623..13f0948 100644
--- a/libgnomecups/gnome-cups-request.c
+++ b/libgnomecups/gnome-cups-request.c
@@ -19,6 +19,36 @@
 #define STOP_UNUSED_THREADS_TIMEOUT 60
 #define CLOSE_UNUSED_CONNECTIONS_TIMEOUT 30
 
+#if (CUPS_VERSION_MAJOR > 1) || (CUPS_VERSION_MINOR > 5)
+#define HAVE_CUPS_1_6 1
+#endif
+
+#ifndef HAVE_CUPS_1_6
+#define ippGetCount(attr)     attr->num_values
+#define ippGetValueTag(attr)  attr->value_tag
+#define ippGetName(attr)      attr->name
+#define ippGetBoolean(attr, element) attr->values[element].boolean
+#define ippGetInteger(attr, element) attr->values[element].integer
+#define ippGetString(attr, element, language) attr->values[element].string.text
+
+static ipp_attribute_t *
+ippFirstAttribute(ipp_t *ipp)
+{
+  if (!ipp)
+    return (NULL);
+  return (ipp->current = ipp->attrs);
+}
+
+static ipp_attribute_t *
+ippNextAttribute(ipp_t *ipp)
+{
+  if (!ipp || !ipp->current)
+    return (NULL);
+  return (ipp->current = ipp->current->next);
+}
+#endif
+
+
 typedef struct
 {
 	GMutex *mutex;
@@ -276,14 +306,14 @@ dump_request (ipp_t const *req)
 	unsigned i;
 	ipp_attribute_t *attr;
 
-	for (attr = req->attrs; attr != NULL; attr = attr->next) {
-		g_print ("%s", attr->name);
-		for (i = 0 ; i < attr->num_values ; i++) {
+	for (attr = ippFirstAttribute (req); attr != NULL; attr = ippNextAttribute (req)) {
+		g_print ("%s", ippGetName (attr));
+		for (i = 0 ; i < ippGetCount (attr) ; i++) {
 			g_print ("\t[%d] = ", i);
-			switch (attr->value_tag & ~IPP_TAG_COPY) {
+			switch (ippGetValueTag (attr) & ~IPP_TAG_COPY) {
 			case IPP_TAG_INTEGER:
 			case IPP_TAG_ENUM:
-				g_print ("%d\n", attr->values[i].integer);
+				g_print ("%d\n", ippGetInteger (attr, i));
 				break;
 
 			case IPP_TAG_STRING:
@@ -294,11 +324,11 @@ dump_request (ipp_t const *req)
 			case IPP_TAG_CHARSET:
 			case IPP_TAG_LANGUAGE:
 			case IPP_TAG_MIMETYPE:
-				g_print ("'%s'\n", attr->values[i].string.text);
+				g_print ("'%s'\n", ippGetString (attr, i, NULL));
 				break;
 
 			case IPP_TAG_BOOLEAN:
-				g_print ("%s\n", (int)attr->values[i].boolean ? "true" : "false");
+				g_print ("%s\n", (int)ippGetBoolean (attr, i) ? "true" : "false");
 				break;
 
 			default:
-- 
1.7.8.6