--- Makefile.in	2025-12-30 01:28:00.000000000 +0800
+++ Makefile.in	2026-03-11 13:48:53.000000000 +0800
@@ -1,12 +1,12 @@
 OBJ=common.o settings.o proc.o encrypt.o password.o file_transfer.o filestore.o filestore_dirlist.o filestore_index.o saved_filestores.o stdout.o fileitem.o file_include_exclude.o list_content_type.o html.o rss.o filecache.o image_display.o extra_hashes.o commands.o ui.o help.o errors_and_logging.o filestore_drivers/fileferry_builtin_drivers.a
-FLAGS=-g -D_FILE_OFFSET_BITS=64 @DEFS@
+FLAGS= @CFLAGS@ -g -D_FILE_OFFSET_BITS=64 @DEFS@
 PREFIX=@prefix@
 LIBS=@LIBS@
 STATIC_LIBUSEFUL=@LIBUSEFUL_BUNDLED@
 
 
 all: $(OBJ) main.c $(STATIC_LIBUSEFUL)
-	gcc $(FLAGS) -o fileferry $(OBJ) main.c $(STATIC_LIBUSEFUL) $(LIBS)
+	$(CC) $(FLAGS) -o fileferry $(OBJ) main.c $(STATIC_LIBUSEFUL) $(LIBS)
 
 libUseful-bundled/libUseful.a:
 	make -C libUseful-bundled
@@ -15,115 +15,115 @@
 	make -C filestore_drivers
 
 common.o: common.h common.c
-	gcc $(FLAGS) -c common.c
+	$(CC) $(FLAGS) -c common.c
 
 proc.o: proc.h proc.c
-	gcc $(FLAGS) -c proc.c
+	$(CC) $(FLAGS) -c proc.c
 
 settings.o: settings.h settings.c
-	gcc $(FLAGS) -c settings.c
+	$(CC) $(FLAGS) -c settings.c
 
 fileitem.o: fileitem.h fileitem.c
-	gcc $(FLAGS) -c fileitem.c
+	$(CC) $(FLAGS) -c fileitem.c
 
 file_transfer.o: file_transfer.h file_transfer.c
-	gcc $(FLAGS) -c file_transfer.c
+	$(CC) $(FLAGS) -c file_transfer.c
 
 ui.o: ui.h ui.c
-	gcc $(FLAGS) -c ui.c
+	$(CC) $(FLAGS) -c ui.c
 
 stdout.o: stdout.h stdout.c
-	gcc $(FLAGS) -c stdout.c
+	$(CC) $(FLAGS) -c stdout.c
 
 help.o: help.h help.c
-	gcc $(FLAGS) -c help.c
+	$(CC) $(FLAGS) -c help.c
 
 list_content_type.o: list_content_type.h list_content_type.c
-	gcc $(FLAGS) -c list_content_type.c
+	$(CC) $(FLAGS) -c list_content_type.c
 
 html.o: html.h html.c
-	gcc $(FLAGS) -c html.c
+	$(CC) $(FLAGS) -c html.c
 
 rss.o: rss.h rss.c
-	gcc $(FLAGS) -c rss.c
+	$(CC) $(FLAGS) -c rss.c
 
 saved_filestores.o: saved_filestores.h saved_filestores.c
-	gcc $(FLAGS) -c saved_filestores.c
+	$(CC) $(FLAGS) -c saved_filestores.c
 
 filestore.o: filestore.h filestore.c
-	gcc $(FLAGS) -c filestore.c
+	$(CC) $(FLAGS) -c filestore.c
 
 filestore_dirlist.o: filestore_dirlist.h filestore_dirlist.c filestore.h
-	gcc $(FLAGS) -c filestore_dirlist.c
+	$(CC) $(FLAGS) -c filestore_dirlist.c
 
 filestore_index.o: filestore_index.h filestore_index.c
-	gcc $(FLAGS) -c filestore_index.c
+	$(CC) $(FLAGS) -c filestore_index.c
 
 file_include_exclude.o: file_include_exclude.h file_include_exclude.c
-	gcc $(FLAGS) -c file_include_exclude.c
+	$(CC) $(FLAGS) -c file_include_exclude.c
 
 localdisk.o: localdisk.h localdisk.c
-	gcc $(FLAGS) -c localdisk.c
+	$(CC) $(FLAGS) -c localdisk.c
 
 ls_decode.o: ls_decode.h ls_decode.c
-	gcc $(FLAGS) -c ls_decode.c
+	$(CC) $(FLAGS) -c ls_decode.c
 
 commands.o: commands.h commands.c
-	gcc $(FLAGS) -c commands.c
+	$(CC) $(FLAGS) -c commands.c
 
 filecache.o: filecache.h filecache.c
-	gcc $(FLAGS) -c filecache.c
+	$(CC) $(FLAGS) -c filecache.c
 
 inet_protocols.o: inet_protocols.h inet_protocols.c
-	gcc $(FLAGS) -c inet_protocols.c
+	$(CC) $(FLAGS) -c inet_protocols.c
 
 image_display.o: image_display.h image_display.c
-	gcc $(FLAGS) -c image_display.c
+	$(CC) $(FLAGS) -c image_display.c
 
 encrypt.o: encrypt.h encrypt.c
-	gcc $(FLAGS) -c encrypt.c
+	$(CC) $(FLAGS) -c encrypt.c
 
 extra_hashes.o: extra_hashes.h extra_hashes.c
-	gcc $(FLAGS) -c extra_hashes.c
+	$(CC) $(FLAGS) -c extra_hashes.c
 
 password.o: password.h password.c
-	gcc $(FLAGS) -c password.c
+	$(CC) $(FLAGS) -c password.c
 
 errors_and_logging.o: errors_and_logging.h errors_and_logging.c
-	gcc $(FLAGS) -c errors_and_logging.c
+	$(CC) $(FLAGS) -c errors_and_logging.c
 
 sftp.o: sftp.h sftp.c
-	gcc $(FLAGS) -c sftp.c
+	$(CC) $(FLAGS) -c sftp.c
 
 ftp.o: ftp.h ftp.c
-	gcc $(FLAGS) -c ftp.c
+	$(CC) $(FLAGS) -c ftp.c
 
 http.o: http.h http.c
-	gcc $(FLAGS) -c http.c
+	$(CC) $(FLAGS) -c http.c
 
 webdav.o: webdav.h webdav.c
-	gcc $(FLAGS) -c webdav.c
+	$(CC) $(FLAGS) -c webdav.c
 
 pop3.o: pop3.h pop3.c
-	gcc $(FLAGS) -c pop3.c
+	$(CC) $(FLAGS) -c pop3.c
 
 gdrive.o: gdrive.h gdrive.c
-	gcc $(FLAGS) -c gdrive.c
+	$(CC) $(FLAGS) -c gdrive.c
 
 dropbox.o: dropbox.h dropbox.c
-	gcc $(FLAGS) -c dropbox.c
+	$(CC) $(FLAGS) -c dropbox.c
 
 filesanywhere.o: filesanywhere.h filesanywhere.c
-	gcc $(FLAGS) -c filesanywhere.c
+	$(CC) $(FLAGS) -c filesanywhere.c
 
 gofile.o: gofile.h gofile.c
-	gcc $(FLAGS) -c gofile.c
+	$(CC) $(FLAGS) -c gofile.c
 
 filebin.o: filebin.h filebin.c
-	gcc $(FLAGS) -c filebin.c
+	$(CC) $(FLAGS) -c filebin.c
 
 synology.o: synology.h synology.c
-	gcc $(FLAGS) -c synology.c
+	$(CC) $(FLAGS) -c synology.c
 
 
 install:

--- filestore_drivers/Makefile.in	2025-12-30 01:28:00.000000000 +0800
+++ filestore_drivers/Makefile.in	2026-03-11 13:48:13.000000000 +0800
@@ -78,52 +78,52 @@
 	ar rcs fileferry_builtin_drivers.a $(FILESTORE_OBJ)
 
 filestore_drivers.o: filestore_drivers.h filestore_drivers.c
-	gcc $(FLAGS) -c filestore_drivers.c
+	$(CC) $(FLAGS) -c filestore_drivers.c
 
 ls_decode.o: ls_decode.h ls_decode.c
-	gcc $(FLAGS) -c ls_decode.c
+	$(CC) $(FLAGS) -c ls_decode.c
 
 inet_protocols.o: inet_protocols.h inet_protocols.c
-	gcc $(FLAGS) -c inet_protocols.c
+	$(CC) $(FLAGS) -c inet_protocols.c
 
 localdisk.o: localdisk.h localdisk.c
-	gcc $(FLAGS) -c localdisk.c
+	$(CC) $(FLAGS) -c localdisk.c
 
 sftp.o: sftp.h sftp.c
-	gcc $(FLAGS) -c sftp.c
+	$(CC) $(FLAGS) -c sftp.c
 
 ftp.o: ftp.h ftp.c
-	gcc $(FLAGS) -c ftp.c
+	$(CC) $(FLAGS) -c ftp.c
 
 http.o: http.h http.c
-	gcc $(FLAGS) -c http.c
+	$(CC) $(FLAGS) -c http.c
 
 webdav.o: webdav.h webdav.c
-	gcc $(FLAGS) -c webdav.c
+	$(CC) $(FLAGS) -c webdav.c
 
 pop3.o: pop3.h pop3.c
-	gcc $(FLAGS) -c pop3.c
+	$(CC) $(FLAGS) -c pop3.c
 
 gopher.o: gopher.h gopher.c
-	gcc $(FLAGS) -c gopher.c
+	$(CC) $(FLAGS) -c gopher.c
 
 gdrive.o: gdrive.h gdrive.c
-	gcc $(FLAGS) -c gdrive.c
+	$(CC) $(FLAGS) -c gdrive.c
 
 dropbox.o: dropbox.h dropbox.c
-	gcc $(FLAGS) -c dropbox.c
+	$(CC) $(FLAGS) -c dropbox.c
 
 filesanywhere.o: filesanywhere.h filesanywhere.c
-	gcc $(FLAGS) -c filesanywhere.c
+	$(CC) $(FLAGS) -c filesanywhere.c
 
 gofile.o: gofile.h gofile.c
-	gcc $(FLAGS) -c gofile.c
+	$(CC) $(FLAGS) -c gofile.c
 
 filebin.o: filebin.h filebin.c
-	gcc $(FLAGS) -c filebin.c
+	$(CC) $(FLAGS) -c filebin.c
 
 synology.o: synology.h synology.c
-	gcc $(FLAGS) -c synology.c
+	$(CC) $(FLAGS) -c synology.c
 
 
 clean: