diff --git a/app/src/adb.h b/app/src/adb.h
index 453e301..e27f34f 100644
--- a/app/src/adb.h
+++ b/app/src/adb.h
@@ -1,11 +1,11 @@
 #ifndef SC_ADB_H
 #define SC_ADB_H
 
+#include "common.h"
+
 #include <stdbool.h>
 #include <inttypes.h>
 
-#include "common.h"
-
 #include "util/process.h"
 
 process_t
diff --git a/app/src/cli.h b/app/src/cli.h
index 22bded7..419f156 100644
--- a/app/src/cli.h
+++ b/app/src/cli.h
@@ -1,9 +1,10 @@
 #ifndef SCRCPY_CLI_H
 #define SCRCPY_CLI_H
 
+#include "common.h"
+
 #include <stdbool.h>
 
-#include "common.h"
 #include "scrcpy.h"
 
 struct scrcpy_cli_args {
diff --git a/app/src/compat.h b/app/src/compat.h
index 21f1921..5464589 100644
--- a/app/src/compat.h
+++ b/app/src/compat.h
@@ -1,6 +1,13 @@
 #ifndef COMPAT_H
 #define COMPAT_H
 
+#define _POSIX_C_SOURCE 200809L
+#define _XOPEN_SOURCE 700
+#define _GNU_SOURCE
+#ifdef __APPLE__
+# define _DARWIN_C_SOURCE
+#endif
+
 #include <libavcodec/version.h>
 #include <libavformat/version.h>
 #include <SDL2/SDL_version.h>
diff --git a/app/src/control_msg.h b/app/src/control_msg.h
index e23cc89..20b2ef4 100644
--- a/app/src/control_msg.h
+++ b/app/src/control_msg.h
@@ -1,11 +1,12 @@
 #ifndef CONTROLMSG_H
 #define CONTROLMSG_H
 
+#include "common.h"
+
 #include <stdbool.h>
 #include <stddef.h>
 #include <stdint.h>
 
-#include "common.h"
 #include "android/input.h"
 #include "android/keycodes.h"
 #include "coords.h"
diff --git a/app/src/controller.h b/app/src/controller.h
index 5ef8755..d6fe35e 100644
--- a/app/src/controller.h
+++ b/app/src/controller.h
@@ -1,11 +1,12 @@
 #ifndef CONTROLLER_H
 #define CONTROLLER_H
 
+#include "common.h"
+
 #include <stdbool.h>
 #include <SDL2/SDL_mutex.h>
 #include <SDL2/SDL_thread.h>
 
-#include "common.h"
 #include "control_msg.h"
 #include "receiver.h"
 #include "util/cbuf.h"
diff --git a/app/src/decoder.h b/app/src/decoder.h
index 8a3bc29..27afcd8 100644
--- a/app/src/decoder.h
+++ b/app/src/decoder.h
@@ -1,11 +1,11 @@
 #ifndef DECODER_H
 #define DECODER_H
 
+#include "common.h"
+
 #include <stdbool.h>
 #include <libavformat/avformat.h>
 
-#include "common.h"
-
 struct video_buffer;
 
 struct decoder {
diff --git a/app/src/device.h b/app/src/device.h
index c21b1ac..376e3d4 100644
--- a/app/src/device.h
+++ b/app/src/device.h
@@ -1,9 +1,10 @@
 #ifndef DEVICE_H
 #define DEVICE_H
 
+#include "common.h"
+
 #include <stdbool.h>
 
-#include "common.h"
 #include "coords.h"
 #include "util/net.h"
 
diff --git a/app/src/device_msg.h b/app/src/device_msg.h
index b186072..bc13ceb 100644
--- a/app/src/device_msg.h
+++ b/app/src/device_msg.h
@@ -1,12 +1,12 @@
 #ifndef DEVICEMSG_H
 #define DEVICEMSG_H
 
+#include "common.h"
+
 #include <stdbool.h>
 #include <stdint.h>
 #include <unistd.h>
 
-#include "common.h"
-
 #define DEVICE_MSG_MAX_SIZE (1 << 18) // 256k
 // type: 1 byte; length: 4 bytes
 #define DEVICE_MSG_TEXT_MAX_LENGTH (DEVICE_MSG_MAX_SIZE - 5)
diff --git a/app/src/event_converter.h b/app/src/event_converter.h
index cbd578a..d28e9fd 100644
--- a/app/src/event_converter.h
+++ b/app/src/event_converter.h
@@ -1,10 +1,11 @@
 #ifndef CONVERT_H
 #define CONVERT_H
 
+#include "common.h"
+
 #include <stdbool.h>
 #include <SDL2/SDL_events.h>
 
-#include "common.h"
 #include "control_msg.h"
 
 bool
diff --git a/app/src/file_handler.h b/app/src/file_handler.h
index 6649b9e..a8f469e 100644
--- a/app/src/file_handler.h
+++ b/app/src/file_handler.h
@@ -1,11 +1,12 @@
 #ifndef FILE_HANDLER_H
 #define FILE_HANDLER_H
 
+#include "common.h"
+
 #include <stdbool.h>
 #include <SDL2/SDL_mutex.h>
 #include <SDL2/SDL_thread.h>
 
-#include "common.h"
 #include "adb.h"
 #include "util/cbuf.h"
 
diff --git a/app/src/fps_counter.h b/app/src/fps_counter.h
index 2c13b3e..68255bb 100644
--- a/app/src/fps_counter.h
+++ b/app/src/fps_counter.h
@@ -1,14 +1,14 @@
 #ifndef FPSCOUNTER_H
 #define FPSCOUNTER_H
 
+#include "common.h"
+
 #include <stdatomic.h>
 #include <stdbool.h>
 #include <stdint.h>
 #include <SDL2/SDL_mutex.h>
 #include <SDL2/SDL_thread.h>
 
-#include "common.h"
-
 struct fps_counter {
     SDL_Thread *thread;
     SDL_mutex *mutex;
diff --git a/app/src/input_manager.h b/app/src/input_manager.h
index 66daa9d..a23a731 100644
--- a/app/src/input_manager.h
+++ b/app/src/input_manager.h
@@ -1,11 +1,12 @@
 #ifndef INPUTMANAGER_H
 #define INPUTMANAGER_H
 
+#include "common.h"
+
 #include <stdbool.h>
 
 #include <SDL2/SDL.h>
 
-#include "common.h"
 #include "controller.h"
 #include "fps_counter.h"
 #include "scrcpy.h"
diff --git a/app/src/main.c b/app/src/main.c
index 18b9c71..e1e44f6 100644
--- a/app/src/main.c
+++ b/app/src/main.c
@@ -1,5 +1,7 @@
 #include "scrcpy.h"
 
+#include "common.h"
+
 #include <assert.h>
 #include <stdbool.h>
 #include <unistd.h>
@@ -7,7 +9,6 @@
 #define SDL_MAIN_HANDLED // avoid link error on Linux Windows Subsystem
 #include <SDL2/SDL.h>
 
-#include "common.h"
 #include "cli.h"
 #include "util/log.h"
 
diff --git a/app/src/opengl.h b/app/src/opengl.h
index 1c1e465..8116370 100644
--- a/app/src/opengl.h
+++ b/app/src/opengl.h
@@ -1,11 +1,11 @@
 #ifndef SC_OPENGL_H
 #define SC_OPENGL_H
 
+#include "common.h"
+
 #include <stdbool.h>
 #include <SDL2/SDL_opengl.h>
 
-#include "common.h"
-
 struct sc_opengl {
     const char *version;
     bool is_opengles;
diff --git a/app/src/receiver.h b/app/src/receiver.h
index 8f62823..3b1cc03 100644
--- a/app/src/receiver.h
+++ b/app/src/receiver.h
@@ -1,11 +1,12 @@
 #ifndef RECEIVER_H
 #define RECEIVER_H
 
+#include "common.h"
+
 #include <stdbool.h>
 #include <SDL2/SDL_mutex.h>
 #include <SDL2/SDL_thread.h>
 
-#include "common.h"
 #include "util/net.h"
 
 // receive events from the device
diff --git a/app/src/recorder.h b/app/src/recorder.h
index fc05d06..1e94211 100644
--- a/app/src/recorder.h
+++ b/app/src/recorder.h
@@ -1,12 +1,13 @@
 #ifndef RECORDER_H
 #define RECORDER_H
 
+#include "common.h"
+
 #include <stdbool.h>
 #include <libavformat/avformat.h>
 #include <SDL2/SDL_mutex.h>
 #include <SDL2/SDL_thread.h>
 
-#include "common.h"
 #include "coords.h"
 #include "scrcpy.h"
 #include "util/queue.h"
diff --git a/app/src/scrcpy.h b/app/src/scrcpy.h
index 08bce7e..2253cc2 100644
--- a/app/src/scrcpy.h
+++ b/app/src/scrcpy.h
@@ -1,12 +1,12 @@
 #ifndef SCRCPY_H
 #define SCRCPY_H
 
+#include "common.h"
+
 #include <stdbool.h>
 #include <stddef.h>
 #include <stdint.h>
 
-#include "common.h"
-
 enum sc_log_level {
     SC_LOG_LEVEL_DEBUG,
     SC_LOG_LEVEL_INFO,
diff --git a/app/src/screen.h b/app/src/screen.h
index 820c738..ea94d53 100644
--- a/app/src/screen.h
+++ b/app/src/screen.h
@@ -1,11 +1,12 @@
 #ifndef SCREEN_H
 #define SCREEN_H
 
+#include "common.h"
+
 #include <stdbool.h>
 #include <SDL2/SDL.h>
 #include <libavformat/avformat.h>
 
-#include "common.h"
 #include "coords.h"
 #include "opengl.h"
 
diff --git a/app/src/server.h b/app/src/server.h
index b48bcd6..7a66670 100644
--- a/app/src/server.h
+++ b/app/src/server.h
@@ -1,12 +1,13 @@
 #ifndef SERVER_H
 #define SERVER_H
 
+#include "common.h"
+
 #include <stdatomic.h>
 #include <stdbool.h>
 #include <stdint.h>
 #include <SDL2/SDL_thread.h>
 
-#include "common.h"
 #include "adb.h"
 #include "scrcpy.h"
 #include "util/log.h"
diff --git a/app/src/stream.h b/app/src/stream.h
index 7b0a5d4..d308df8 100644
--- a/app/src/stream.h
+++ b/app/src/stream.h
@@ -1,13 +1,14 @@
 #ifndef STREAM_H
 #define STREAM_H
 
+#include "common.h"
+
 #include <stdbool.h>
 #include <stdint.h>
 #include <libavformat/avformat.h>
 #include <SDL2/SDL_atomic.h>
 #include <SDL2/SDL_thread.h>
 
-#include "common.h"
 #include "util/net.h"
 
 struct video_buffer;
diff --git a/app/src/sys/unix/process.c b/app/src/sys/unix/process.c
index dc4f564..3bb5501 100644
--- a/app/src/sys/unix/process.c
+++ b/app/src/sys/unix/process.c
@@ -1,14 +1,3 @@
-// for portability (kill, readlink, strdup, strtok_r)
-#define _POSIX_C_SOURCE 200809L
-#define _BSD_SOURCE
-
-// modern glibc will complain without this
-#define _DEFAULT_SOURCE
-
-#ifdef __APPLE__
-# define _DARWIN_C_SOURCE // for strdup(), strtok_r(), memset_pattern4()
-#endif
-
 #include "util/process.h"
 
 #include <errno.h>
diff --git a/app/src/tiny_xpm.h b/app/src/tiny_xpm.h
index 2dcbeb0..29b42d1 100644
--- a/app/src/tiny_xpm.h
+++ b/app/src/tiny_xpm.h
@@ -1,10 +1,10 @@
 #ifndef TINYXPM_H
 #define TINYXPM_H
 
-#include <SDL2/SDL.h>
-
 #include "common.h"
 
+#include <SDL2/SDL.h>
+
 SDL_Surface *
 read_xpm(char *xpm[]);
 
diff --git a/app/src/util/buffer_util.h b/app/src/util/buffer_util.h
index 265704b..ab22ab2 100644
--- a/app/src/util/buffer_util.h
+++ b/app/src/util/buffer_util.h
@@ -1,11 +1,11 @@
 #ifndef BUFFER_UTIL_H
 #define BUFFER_UTIL_H
 
+#include "common.h"
+
 #include <stdbool.h>
 #include <stdint.h>
 
-#include "common.h"
-
 static inline void
 buffer_write16be(uint8_t *buf, uint16_t value) {
     buf[0] = value >> 8;
diff --git a/app/src/util/cbuf.h b/app/src/util/cbuf.h
index 6abc984..01e4104 100644
--- a/app/src/util/cbuf.h
+++ b/app/src/util/cbuf.h
@@ -2,11 +2,11 @@
 #ifndef CBUF_H
 #define CBUF_H
 
+#include "common.h"
+
 #include <stdbool.h>
 #include <unistd.h>
 
-#include "common.h"
-
 // To define a circular buffer type of 20 ints:
 //     struct cbuf_int CBUF(int, 20);
 //
diff --git a/app/src/util/lock.h b/app/src/util/lock.h
index a0a044b..f031bd6 100644
--- a/app/src/util/lock.h
+++ b/app/src/util/lock.h
@@ -1,10 +1,11 @@
 #ifndef LOCK_H
 #define LOCK_H
 
+#include "common.h"
+
 #include <stdint.h>
 #include <SDL2/SDL_mutex.h>
 
-#include "common.h"
 #include "log.h"
 
 static inline void
diff --git a/app/src/util/net.h b/app/src/util/net.h
index f86c048..d3b1f94 100644
--- a/app/src/util/net.h
+++ b/app/src/util/net.h
@@ -1,6 +1,8 @@
 #ifndef NET_H
 #define NET_H
 
+#include "common.h"
+
 #include <stdbool.h>
 #include <stdint.h>
 #include <SDL2/SDL_platform.h>
@@ -17,8 +19,6 @@
   typedef int socket_t;
 #endif
 
-#include "common.h"
-
 bool
 net_init(void);
 
diff --git a/app/src/util/process.h b/app/src/util/process.h
index f91553d..46e481b 100644
--- a/app/src/util/process.h
+++ b/app/src/util/process.h
@@ -1,10 +1,10 @@
 #ifndef SC_PROCESS_H
 #define SC_PROCESS_H
 
-#include <stdbool.h>
-
 #include "common.h"
 
+#include <stdbool.h>
+
 #ifdef _WIN32
 
  // not needed here, but winsock2.h must never be included AFTER windows.h
diff --git a/app/src/util/queue.h b/app/src/util/queue.h
index 6092c71..0681070 100644
--- a/app/src/util/queue.h
+++ b/app/src/util/queue.h
@@ -2,12 +2,12 @@
 #ifndef QUEUE_H
 #define QUEUE_H
 
+#include "common.h"
+
 #include <assert.h>
 #include <stdbool.h>
 #include <stddef.h>
 
-#include "common.h"
-
 // To define a queue type of "struct foo":
 //    struct queue_foo QUEUE(struct foo);
 #define QUEUE(TYPE) { \
diff --git a/app/src/util/str_util.h b/app/src/util/str_util.h
index dd52340..25bec44 100644
--- a/app/src/util/str_util.h
+++ b/app/src/util/str_util.h
@@ -1,11 +1,11 @@
 #ifndef STRUTIL_H
 #define STRUTIL_H
 
+#include "common.h"
+
 #include <stdbool.h>
 #include <stddef.h>
 
-#include "common.h"
-
 // like strncpy, except:
 //  - it copies at most n-1 chars
 //  - the dest string is nul-terminated
diff --git a/app/src/video_buffer.h b/app/src/video_buffer.h
index ddd639a..68ef8e0 100644
--- a/app/src/video_buffer.h
+++ b/app/src/video_buffer.h
@@ -1,10 +1,11 @@
 #ifndef VIDEO_BUFFER_H
 #define VIDEO_BUFFER_H
 
+#include "common.h"
+
 #include <stdbool.h>
 #include <SDL2/SDL_mutex.h>
 
-#include "common.h"
 #include "fps_counter.h"
 
 // forward declarations
diff --git a/app/tests/test_buffer_util.c b/app/tests/test_buffer_util.c
index d61e691..c7c13bd 100644
--- a/app/tests/test_buffer_util.c
+++ b/app/tests/test_buffer_util.c
@@ -1,3 +1,5 @@
+#include "common.h"
+
 #include <assert.h>
 
 #include "util/buffer_util.h"
diff --git a/app/tests/test_cbuf.c b/app/tests/test_cbuf.c
index f8beb88..16674e9 100644
--- a/app/tests/test_cbuf.c
+++ b/app/tests/test_cbuf.c
@@ -1,3 +1,5 @@
+#include "common.h"
+
 #include <assert.h>
 #include <string.h>
 
diff --git a/app/tests/test_cli.c b/app/tests/test_cli.c
index 9699b02..cd222d6 100644
--- a/app/tests/test_cli.c
+++ b/app/tests/test_cli.c
@@ -1,7 +1,8 @@
+#include "common.h"
+
 #include <assert.h>
 #include <string.h>
 
-#include "common.h"
 #include "cli.h"
 #include "scrcpy.h"
 
diff --git a/app/tests/test_control_msg_serialize.c b/app/tests/test_control_msg_serialize.c
index b58c8e2..ffd5f30 100644
--- a/app/tests/test_control_msg_serialize.c
+++ b/app/tests/test_control_msg_serialize.c
@@ -1,3 +1,5 @@
+#include "common.h"
+
 #include <assert.h>
 #include <string.h>
 
diff --git a/app/tests/test_device_msg_deserialize.c b/app/tests/test_device_msg_deserialize.c
index 3dfd0b0..3427d64 100644
--- a/app/tests/test_device_msg_deserialize.c
+++ b/app/tests/test_device_msg_deserialize.c
@@ -1,3 +1,5 @@
+#include "common.h"
+
 #include <assert.h>
 #include <string.h>
 
diff --git a/app/tests/test_queue.c b/app/tests/test_queue.c
index e10821c..fcbafc6 100644
--- a/app/tests/test_queue.c
+++ b/app/tests/test_queue.c
@@ -1,3 +1,5 @@
+#include "common.h"
+
 #include <assert.h>
 
 #include "util/queue.h"
diff --git a/app/tests/test_strutil.c b/app/tests/test_strutil.c
index 7b9c61d..9d35f98 100644
--- a/app/tests/test_strutil.c
+++ b/app/tests/test_strutil.c
@@ -1,3 +1,5 @@
+#include "common.h"
+
 #include <assert.h>
 #include <limits.h>
 #include <stdio.h>