Index: src/a2dp-codecs.h
--- src/a2dp-codecs.h.orig
+++ src/a2dp-codecs.h
@@ -11,6 +11,7 @@
 #define BLUEZQT_A2DPCODECS_H
 
 #include <stdint.h>
+#include <endian.h>
 
 // clang-format off
 
@@ -141,7 +142,7 @@ typedef struct {
 	uint16_t codec_id;
 } __attribute__ ((packed)) a2dp_vendor_codec_t;
 
-#if __BYTE_ORDER == __LITTLE_ENDIAN
+#if BYTE_ORDER == LITTLE_ENDIAN
 
 typedef struct {
 	uint8_t channel_mode:4;
@@ -186,7 +187,7 @@ typedef struct {
 	uint8_t unknown[2];
 } __attribute__ ((packed)) a2dp_ldac_t;
 
-#elif __BYTE_ORDER == __BIG_ENDIAN
+#elif BYTE_ORDER == BIG_ENDIAN
 
 typedef struct {
 	uint8_t frequency:4;