[R] if zlib version >= 1.2.5... no

[peter dalgaard]

This was fixed (independently?) in r-devel today:

Peter-Dalgaards-MacBook-Air:R pd$ svn log m4/R.m4 | head
------------------------------------------------------------------------
r71889 | lawrence | 2017-01-04 04:57:31 +0100 (Wed, 04 Jan 2017) | 4 lines

R_ZLIB macro tests ZLIB_VERNUM to handle zlib 1.2.10 (6 chars)

Thanks to George Hartzell for the fix.
---

-pd


> On 04 Jan 2017, at 17:09 , bastl73 <bastl73 at freenet.de> wrote:
> 
> Configuring R with zlib-1.2.10 I get this error:
> 
> checking for zlib.h... yes
> checking if zlib version >= 1.2.5... no
> checking whether zlib support suffices... configure: error: zlib library and headers 
> are required
> 
> So I asked Mark from zlib about this problem and he wrote back:
> 
>> exit(strncmp(ZLIB_VERSION, "1.2.5", 5) < 0);
> 
> strcmp("1.2.10", "1.2.5") will indicate incorrectly that the 1.2.10 is *less* than 
> 1.2.5. This is why there is ZLIB_VERNUM, which is a number that can be compared. So 
> it should be simply:
> 
>    exit(ZLIB_VERNUM < 0x1250);
> 
> 
> bastl
> 
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-- 
Peter Dalgaard, Professor,
Center for Statistics, Copenhagen Business School
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