Offline download of sources fails

[Ida Delphine]

Hello,
On trying to download my sources using this command stated in the
documentation:

../source-builder/sb-set-builder --source-only-download 5/rtems-sparc

Unfortunately, I get some errors and the build fails:
RTEMS Source Builder - Set Builder, 6 (47d540e7f9fe)
error: exe: not found: (__bison) /usr/bin/bison
error: exe: not found: (__flex) /usr/bin/flex
error: host build environment is not set up correctly
Build FAILED

Please what's the way out? I've been trying to resolve this for hours.

Cheers,

Ida.
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