Avrdude cannot build with our version of libusb. This patch fixes that.
See http://savannah.nongnu.org/bugs/?41854

diff --git a/dfu.c b/dfu.c
index 7d349bc..0f80440 100644
--- a/dfu.c
+++ b/dfu.c
@@ -36,13 +36,14 @@
 
 #ifndef HAVE_LIBUSB
 
-int dfu_open(struct dfu_dev *dfu, char *port_name) {
+struct dfu_dev * dfu_open(char *port_spec) {
   fprintf(stderr, "%s: Error: No USB support in this compile of avrdude\n",
     progname);
-  return -1;
+  return NULL;
 }
 
-int dfu_init(struct dfu_dev *dfu, unsigned short usb_pid) {
+int dfu_init(struct dfu_dev *dfu,
+  unsigned short vid, unsigned short pid) {
   return -1;
 }
 
diff --git a/flip1.c b/flip1.c
index b891d80..0959996 100644
--- a/flip1.c
+++ b/flip1.c
@@ -164,6 +164,8 @@ static void flip1_setup(PROGRAMMER * pgm);
 static void flip1_teardown(PROGRAMMER * pgm);
 
 /* INTERNAL PROGRAMMER FUNCTION PROTOTYPES */
+#ifdef HAVE_LIBUSB
+// The internal ones are made conditional, as they're not defined further down #ifndef HAVE_LIBUSB
 
 static void flip1_show_info(struct flip1 *flip1);
 
@@ -177,6 +179,8 @@ static const char * flip1_mem_unit_str(enum flip1_mem_unit mem_unit);
 static int flip1_set_mem_page(struct dfu_dev *dfu, unsigned short page_addr);
 static enum flip1_mem_unit flip1_mem_unit(const char *name);
 
+#endif /* HAVE_LIBUSB */
+
 /* THE INITPGM FUNCTION DEFINITIONS */
 
 void flip1_initpgm(PROGRAMMER *pgm)
@@ -201,6 +205,7 @@ void flip1_initpgm(PROGRAMMER *pgm)
   pgm->teardown         = flip1_teardown;
 }
 
+#ifdef HAVE_LIBUSB
 /* EXPORTED PROGRAMMER FUNCTION DEFINITIONS */
 
 int flip1_open(PROGRAMMER *pgm, char *port_spec)
@@ -876,3 +881,82 @@ enum flip1_mem_unit flip1_mem_unit(const char *name) {
     return FLIP1_MEM_UNIT_EEPROM;
   return FLIP1_MEM_UNIT_UNKNOWN;
 }
+#else /* HAVE_LIBUSB */
+// Dummy functions
+int flip1_open(PROGRAMMER *pgm, char *port_spec)
+{
+  fprintf(stderr, "%s: Error: No USB support in this compile of avrdude\n",
+    progname);
+  return NULL;
+}
+
+int flip1_initialize(PROGRAMMER* pgm, AVRPART *part)
+{
+  return -1;
+}
+
+void flip1_close(PROGRAMMER* pgm)
+{
+}
+
+void flip1_enable(PROGRAMMER* pgm)
+{
+}
+
+void flip1_disable(PROGRAMMER* pgm)
+{
+}
+
+void flip1_display(PROGRAMMER* pgm, const char *prefix)
+{
+}
+
+int flip1_program_enable(PROGRAMMER* pgm, AVRPART *part)
+{
+  return -1;
+}
+
+int flip1_chip_erase(PROGRAMMER* pgm, AVRPART *part)
+{
+  return -1;
+}
+
+int flip1_read_byte(PROGRAMMER* pgm, AVRPART *part, AVRMEM *mem,
+  unsigned long addr, unsigned char *value)
+{
+  return -1;
+}
+
+int flip1_write_byte(PROGRAMMER* pgm, AVRPART *part, AVRMEM *mem,
+  unsigned long addr, unsigned char value)
+{
+  return -1;
+}
+
+int flip1_paged_load(PROGRAMMER* pgm, AVRPART *part, AVRMEM *mem,
+  unsigned int page_size, unsigned int addr, unsigned int n_bytes)
+{
+  return -1;
+}
+
+int flip1_paged_write(PROGRAMMER* pgm, AVRPART *part, AVRMEM *mem,
+  unsigned int page_size, unsigned int addr, unsigned int n_bytes)
+{
+  return -1;
+}
+
+int flip1_read_sig_bytes(PROGRAMMER* pgm, AVRPART *part, AVRMEM *mem)
+{
+  return -1;
+}
+
+void flip1_setup(PROGRAMMER * pgm)
+{
+}
+
+void flip1_teardown(PROGRAMMER * pgm)
+{
+}
+
+
+#endif /* HAVE_LIBUSB */
\ No newline at end of file

diff --git a/flip2.c b/flip2.c
index ed8e996..16c4bf8 100644
--- a/flip2.c
+++ b/flip2.c
@@ -151,6 +151,8 @@ static void flip2_setup(PROGRAMMER * pgm);
 static void flip2_teardown(PROGRAMMER * pgm);
 
 /* INTERNAL PROGRAMMER FUNCTION PROTOTYPES */
+#ifdef HAVE_LIBUSB
+// The internal ones are made conditional, as they're not defined further down #ifndef HAVE_LIBUSB
 
 static void flip2_show_info(struct flip2 *flip2);
 
@@ -171,6 +173,8 @@ static const char * flip2_status_str(const struct dfu_status *status);
 static const char * flip2_mem_unit_str(enum flip2_mem_unit mem_unit);
 static enum flip2_mem_unit flip2_mem_unit(const char *name);
 
+#endif /* HAVE_LIBUSB */
+
 /* THE INITPGM FUNCTION DEFINITIONS */
 
 void flip2_initpgm(PROGRAMMER *pgm)
@@ -195,6 +199,7 @@ void flip2_initpgm(PROGRAMMER *pgm)
   pgm->teardown         = flip2_teardown;
 }
 
+#ifdef HAVE_LIBUSB
 /* EXPORTED PROGRAMMER FUNCTION DEFINITIONS */
 
 int flip2_open(PROGRAMMER *pgm, char *port_spec)
@@ -922,3 +927,85 @@ enum flip2_mem_unit flip2_mem_unit(const char *name) {
     return FLIP2_MEM_UNIT_SIGNATURE;
   return FLIP2_MEM_UNIT_UNKNOWN;
 }
+
+#else /* HAVE_LIBUSB */
+
+/* EXPORTED PROGRAMMER FUNCTION DEFINITIONS */
+
+int flip2_open(PROGRAMMER *pgm, char *port_spec)
+{
+  fprintf(stderr, "%s: Error: No USB support in this compile of avrdude\n",
+    progname);
+  return NULL;
+}
+
+int flip2_initialize(PROGRAMMER* pgm, AVRPART *part)
+{
+  return -1;
+}
+
+void flip2_close(PROGRAMMER* pgm)
+{
+}
+
+void flip2_enable(PROGRAMMER* pgm)
+{
+}
+
+void flip2_disable(PROGRAMMER* pgm)
+{
+}
+
+void flip2_display(PROGRAMMER* pgm, const char *prefix)
+{
+}
+
+int flip2_program_enable(PROGRAMMER* pgm, AVRPART *part)
+{
+  return -1;
+}
+
+int flip2_chip_erase(PROGRAMMER* pgm, AVRPART *part)
+{
+  return -1;
+}
+
+int flip2_read_byte(PROGRAMMER* pgm, AVRPART *part, AVRMEM *mem,
+  unsigned long addr, unsigned char *value)
+{
+  return -1;
+}
+
+int flip2_write_byte(PROGRAMMER* pgm, AVRPART *part, AVRMEM *mem,
+  unsigned long addr, unsigned char value)
+{
+  return -1;
+}
+
+int flip2_paged_load(PROGRAMMER* pgm, AVRPART *part, AVRMEM *mem,
+  unsigned int page_size, unsigned int addr, unsigned int n_bytes)
+{
+  return -1;
+}
+
+int flip2_paged_write(PROGRAMMER* pgm, AVRPART *part, AVRMEM *mem,
+  unsigned int page_size, unsigned int addr, unsigned int n_bytes)
+{
+  return -1;
+}
+
+int flip2_read_sig_bytes(PROGRAMMER* pgm, AVRPART *part, AVRMEM *mem)
+{
+  return -1;
+}
+
+void flip2_setup(PROGRAMMER * pgm)
+{
+}
+
+void flip2_teardown(PROGRAMMER * pgm)
+{
+}
+
+
+#endif /* HAVE_LIBUSB */