Christopher Allan Webber writes:

> 宋文武 writes:
>
>>>   make[1]: *** [all-recursive] Error 1
>>>   make[1]: Leaving directory '/tmp/nix-build-extremetuxracer-0.6.0.drv-0/etr-0.6.0'
>>>   Makefile:457: recipe for target 'all' failed
>>>   make: *** [all] Error 2
>>>
>>> sdl is an input, so I don't know what's going on...
>>>
>>> Sorry!  I thought this one was going to be an easy package that I
>>> wouldn't need much help on!
>> oops, I take a deep look.  It turn out that
>> this package set the flags (for SDL, etc.) as 'CFLAGS',
>> but it only use 'CXXFLAGS' (only have freetype) when compile cpp files.
>> I think we can patch the Makefile after 'configure' phase, by:
>>
>>   (substitute* "Makefile"
>>     (("CXXFLAGS =") "CXXFLAGS = ${CFLAGS)"))
>>
>> And better, ask upstream for a real fix :-)
>
> Spot on!  (Well mostly!  ${CFLAGS} not ${CFLAGS), I was confused for a
> minute :))  But this was exactly what was needed!  We now have a working
> (extreme) tuxracer!
>
> We're a REAL distro now!
>  - cwebb

Okay, Dave Thompson pointed out I should use modify-phases.  Done!