Starting RT-Thread for RPi Pico, Confusion with scons

I am attempting to learn rt-thread using the raspberry pi pico. I am running into numerous issues, and I am frankly confused about the entire build process.

I've cloned the rt-thread git repo, navigated to the pico bsp and tried running scons and received the following errors:

scons: Reading SConscript files ...
scons: done reading SConscript files.
scons: Building targets ...
scons: building associated VariantDir targets: build
CC build/applications/main.o
In file included from /usr/arm-none-eabi/include/signal.h:6,
                 from /storage/Shared/Documents/rtthread/rt-thread/include/libc/libc_signal.h:72,
                 from /storage/Shared/Documents/rtthread/rt-thread/include/rtlibc.h:21,
                 from /storage/Shared/Documents/rtthread/rt-thread/include/rtdef.h:1146,
                 from /storage/Shared/Documents/rtthread/rt-thread/include/rtthread.h:25,
                 from applications/main.c:11:
/usr/arm-none-eabi/include/sys/signal.h:42:7: error: redefinition of 'union sigval'
   42 | union sigval {
      |       ^~~~~~
In file included from /storage/Shared/Documents/rtthread/rt-thread/include/rtlibc.h:21,
                 from /storage/Shared/Documents/rtthread/rt-thread/include/rtdef.h:1146,
                 from /storage/Shared/Documents/rtthread/rt-thread/include/rtthread.h:25,
                 from applications/main.c:11:
/storage/Shared/Documents/rtthread/rt-thread/include/libc/libc_signal.h:28:7: note: originally defined here
   28 | union sigval
      |       ^~~~~~
In file included from /usr/arm-none-eabi/include/signal.h:6,
                 from /storage/Shared/Documents/rtthread/rt-thread/include/libc/libc_signal.h:72,
                 from /storage/Shared/Documents/rtthread/rt-thread/include/rtlibc.h:21,
                 from /storage/Shared/Documents/rtthread/rt-thread/include/rtdef.h:1146,
                 from /storage/Shared/Documents/rtthread/rt-thread/include/rtthread.h:25,
                 from applications/main.c:11:
/usr/arm-none-eabi/include/sys/signal.h:47:8: error: redefinition of 'struct sigevent'
   47 | struct sigevent {
      |        ^~~~~~~~
In file included from /storage/Shared/Documents/rtthread/rt-thread/include/rtlibc.h:21,
                 from /storage/Shared/Documents/rtthread/rt-thread/include/rtdef.h:1146,
                 from /storage/Shared/Documents/rtthread/rt-thread/include/rtthread.h:25,
                 from applications/main.c:11:
/storage/Shared/Documents/rtthread/rt-thread/include/libc/libc_signal.h:36:8: note: originally defined here
   36 | struct sigevent
      |        ^~~~~~~~
In file included from /usr/arm-none-eabi/include/signal.h:6,
                 from /storage/Shared/Documents/rtthread/rt-thread/include/libc/libc_signal.h:72,
                 from /storage/Shared/Documents/rtthread/rt-thread/include/rtlibc.h:21,
                 from /storage/Shared/Documents/rtthread/rt-thread/include/rtdef.h:1146,
                 from /storage/Shared/Documents/rtthread/rt-thread/include/rtthread.h:25,
                 from applications/main.c:11:
/usr/arm-none-eabi/include/sys/signal.h:72:3: error: conflicting types for 'siginfo_t'; have 'struct <anonymous>'
   72 | } siginfo_t;
      |   ^~~~~~~~~
In file included from /storage/Shared/Documents/rtthread/rt-thread/include/rtlibc.h:21,
                 from /storage/Shared/Documents/rtthread/rt-thread/include/rtdef.h:1146,
                 from /storage/Shared/Documents/rtthread/rt-thread/include/rtthread.h:25,
                 from applications/main.c:11:
/storage/Shared/Documents/rtthread/rt-thread/include/libc/libc_signal.h:55:24: note: previous declaration of 'siginfo_t' with type 'siginfo_t' {aka 'struct siginfo'}
   55 | typedef struct siginfo siginfo_t;
      |                        ^~~~~~~~~

More on this, reading through the readme, it seems like I am supposed to specify a target IDE (i.e. keil, mdk, ...) but I just want to use gcc and a makefile. I don't see the actual options for target listed so I am unsure of how to say "just build for gcc". Any help would be appreciated.

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