GNU's make error codes - list

Hi,

I often encounter make errors. Many a times, a corresponding error code is also shown, like

make: [run] Error 56 (ignored)
make: [run] Error 91 (ignored)
make: [run] Error 96 (ignored)

et al.

I tried google'ing as well as searching this forum for what these error codes mean.

I know, make does not generate an error code. It displays an error message.

But these codes must be referring to something.

Is it documented anywhere ? Does anyone have a list for the same, mapping an error code to a message ?

Thanks.

For GNU make it means that some program make invoked returned that error code.
It is really not an internal make error code.

See:

http://www.gnu.org/software/make/manual/html\_chapter/make_16.html\#SEC134