• initial stropts.h error.. so I used development branch (git clone https://github.com/mysensors/MySensors.git --branch development )
• then the problem in ATOMIC Block

./hal/architecture/Linux/MyHwLinuxGeneric.h:106:50: error: ambiguating new declaration of ‘uint8_t __hwLock()’
  106 | #define ATOMIC_BLOCK for ( ATOMIC_BLOCK_CLEANUP, __hwLock(); \

I think I solved I solved it by replacing a coupe lines in MyHwLinuxGeneric.h file as per advice of some other posts ([https://github.com/mysensors/MySensors/issues/1557 )

then compilation was ok, but running I got GPIO error message:

~/MySensors $ sudo ./bin/mysgw
Oct 25 09:51:59 INFO  Starting gateway...
Oct 25 09:51:59 INFO  Protocol version - 2.4.0-rc.1
Oct 25 09:51:59 DEBUG MCO:BGN:INIT GW,CP=RNNGL-Q-,FQ=NA,REL=2,VER=2.4.0-rc.1
Oct 25 09:51:59 DEBUG TSF:LRT:OK
Oct 25 09:51:59 DEBUG TSM:INIT
Oct 25 09:51:59 DEBUG TSF:WUR:MS=0
Oct 25 09:52:10 ERROR Could not open /sys/class/gpio/gpio15/direction

I found this post : link text which had similar type of error and pointing to a commit #1562
Unfortunately, I'm not understanding very well how github works. I tried to download the 4 different modified files and replace the original ones, one by one (hopefully I downloaded correct ones, I don't feel very comfortable) .
Then I installed also the new lib ( sudo apt-get install libgpiod-dev ), launched again the config

sudo ./configure --my-transport=rf24 --my-rf24-irq-pin=15

but when I launch sudo make, then I can't compile anymore:

hal/architecture/Linux/drivers/core/interrupt.cpp:108:27: error: ‘gpiod_line_event_wait’ was not declared in this scope; did you mean ‘gpiod_info_event_type’?
  108 |                 int ret = gpiod_line_event_wait(line, NULL);
      |                           ^~~~~~~~~~~~~~~~~~~~~
      |                           gpiod_info_event_type
hal/architecture/Linux/drivers/core/interrupt.cpp:113:41: error: aggregate ‘interruptHandler(void*)::gpiod_line_event event’ has incomplete type and cannot be defined
  113 |                 struct gpiod_line_event event;
      |                                         ^~~~~
hal/architecture/Linux/drivers/core/interrupt.cpp:114:21: error: ‘gpiod_line_event_read’ was not declared in this scope; did you mean ‘gpiod_line_event’?
  114 |                 if (gpiod_line_event_read(line, &event) == 0) {
      |                     ^~~~~~~~~~~~~~~~~~~~~
      |                     gpiod_line_event
hal/architecture/Linux/drivers/core/interrupt.cpp:115:49: error: ‘GPIOD_LINE_EVENT_RISING_EDGE’ was not declared in this scope; did you mean ‘GPIOD_EDGE_EVENT_RISING_EDGE’?
  115 |                         if (event.event_type == GPIOD_LINE_EVENT_RISING_EDGE) {
      |                                                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |                                                 GPIOD_EDGE_EVENT_RISING_EDGE
hal/architecture/Linux/drivers/core/interrupt.cpp:134:9: error: ‘gpiod_line_release’ was not declared in this scope; did you mean ‘gpiod_line_request’?
  134 |         gpiod_line_release(line);
      |         ^~~~~~~~~~~~~~~~~~
      |         gpiod_line_request
hal/architecture/Linux/drivers/core/interrupt.cpp:91:14: warning: unused variable ‘c’ [-Wunused-variable]
   91 |         char c;
      |              ^
hal/architecture/Linux/drivers/core/interrupt.cpp: In function ‘void attachInterrupt(uint8_t, void (*)(), uint8_t)’:
hal/architecture/Linux/drivers/core/interrupt.cpp:157:26: warning: ISO C++ forbids converting a string constant to ‘char*’ [-Wwrite-strings]
  157 |         char *chipname = "gpiochip0";
      |                          ^~~~~~~~~~~
hal/architecture/Linux/drivers/core/interrupt.cpp:159:33: error: aggregate ‘attachInterrupt(uint8_t, void (*)(), uint8_t)::gpiod_line_event event’ has incomplete type and cannot be defined
  159 |         struct gpiod_line_event event;
      |                                 ^~~~~
hal/architecture/Linux/drivers/core/interrupt.cpp:164:16: error: ‘gpiod_chip_open_by_name’ was not declared in this scope; did you mean ‘gpiod_chip_info_get_name’?
  164 |         chip = gpiod_chip_open_by_name(chipname);
      |                ^~~~~~~~~~~~~~~~~~~~~~~
      |                gpiod_chip_info_get_name
hal/architecture/Linux/drivers/core/interrupt.cpp:170:16: error: ‘gpiod_chip_get_line’ was not declared in this scope; did you mean ‘gpiod_chip_get_info’?
  170 |         line = gpiod_chip_get_line(chip, line_num);
      |                ^~~~~~~~~~~~~~~~~~~
      |                gpiod_chip_get_info
hal/architecture/Linux/drivers/core/interrupt.cpp:178:17: error: ‘gpiod_line_request_both_edges_events’ was not declared in this scope; did you mean ‘gpiod_line_request_wait_edge_events’?
  178 |                 gpiod_line_request_both_edges_events(line, "gpiointerrupt");
      |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |                 gpiod_line_request_wait_edge_events
hal/architecture/Linux/drivers/core/interrupt.cpp:181:17: error: ‘gpiod_line_request_falling_edge_events’ was not declared in this scope; did you mean ‘gpiod_line_request_wait_edge_events’?
  181 |                 gpiod_line_request_falling_edge_events(line, "gpiointerrupt");
      |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |                 gpiod_line_request_wait_edge_events
hal/architecture/Linux/drivers/core/interrupt.cpp:184:17: error: ‘gpiod_line_request_rising_edge_events’ was not declared in this scope; did you mean ‘gpiod_line_request_wait_edge_events’?
  184 |                 gpiod_line_request_rising_edge_events(line, "gpiointerrupt");
      |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |                 gpiod_line_request_wait_edge_events
hal/architecture/Linux/drivers/core/interrupt.cpp:194:40: error: ‘gpiod_line_event_get_fd’ was not declared in this scope; did you mean ‘gpiod_line_request_get_fd’?
  194 |                 if ((sysFds[gpioPin] = gpiod_line_event_get_fd(line)) < 0) {
      |                                        ^~~~~~~~~~~~~~~~~~~~~~~
      |                                        gpiod_line_request_get_fd

What do I do wrong ?
Thanks for your help..