Hi!

I'm trying to install RTEMS on Ubuntu. I follow the instructions here
https://ftp.rtems.org/pub/rtems/releases/5/5.1

After trying to build the tools:

../source-builder/sb-set-builder \
  --prefix=/development/rtems/5.1 \
  5/rtems-sparc

I get this error:

RTEMS Source Builder - Set Builder, 5.1
error: exe: not found: (__bison) /usr/bin/bison
error: exe: not found: (__flex) /usr/bin/flex
error: exe: not found: (__makeinfo) /usr/bin/makeinfo
error: host build environment is not set up correctly
Build FAILED

I also tried to follow this tutorial
https://ftp.rtems.org/pub/rtems/releases/5/5.1/docs/html/user/start/sources.html,
but there is no https://ftp.rtems.org/pub/rtems/releases/5/5.1.0,

only 5.0.0 and 5.1.

So I ran $ wget
https://ftp.rtems.org/pub/rtems/releases/5/5.1/rtems-source-builder-5.1.tar.xz
| tar xJf -

and got this error:

--2021-03-09 18:39:11--
https://ftp.rtems.org/pub/rtems/releases/5/5.1/rtems-source-builder-5.1.tar.xz
Resolving ftp.rtems.org (ftp.rtems.org)... 140.211.10.151
Connecting to ftp.rtems.org (ftp.rtems.org)|140.211.10.151|:443... connected.
HTTP request sent, awaiting response... 404 Not Found
2021-03-09 18:39:12 ERROR 404: Not Found.

xz: (stdin): File format not recognized
tar: Child returned status 1
tar: Error is not recoverable: exiting now

What am I doing wrong? I would highly appreciate any help.
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