[collectd] collectd 5.1.0/error: implicit declaration of function 'isnan'

[giovanni.v]

Hi,
I am trying to compile collectd 5.1.0 on T2 linux, target is x86 (i486) 
for an embedded PIII board using uclibc.
Apart from a bunch of directives to disable things I don't need, 
because configure fails some tests at cross-compilation stage I added:
  --with-fp-layout=nothing

The above directive allowed configuration to exit normally but building 
libcollectdclient fails:

cc1: warnings being treated as errors
client.c: In function 'lcc_putval':
client.c:826:7: error: implicit declaration of function 'isnan'
make[4]: *** [client.lo] Error 1

So I tried:
  --with-nan-emulation=no

Also tried --with-nan-emulation, --with-nan-emulation=yes, zero... but 
no luck.

Doing some research on the net I found some old messages on the bsd 
mailing list also speaking about a configure option to disable compiling 
the collectd client but I was actually unable to find that option.

Any clue?
Build log attached.

Regards, Giovanni.
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