Compilation error - iconv

[rohlfs]

I could not compile the package:
uname -a
FreeBSD 9.2-RELEASE-p3 amd64

install.package("readr")

In file included from DateTimeLocale.h:5:0,
from DateTime.h:6,
from CollectorDateTime.h:6,
from Collector.cpp:13:
Iconv.h: In member function 'std::string Iconv::convert(std::string)':
Iconv.h:47:73: error: invalid conversion from 'char**' to 'const char**' [-fpermissive]
size_t res = iconv(cd_, &inbuf, &inbytesleft, &outbuf, &outbytesleft);
^
In file included from Iconv.h:4:0,
from DateTimeLocale.h:5,
from DateTime.h:6,
from CollectorDateTime.h:6,
from Collector.cpp:13:
/usr/local/include/iconv.h:83:15: error: initializing argument 2 of 'size_t libiconv(libiconv_t, const char**, size_t*, char**, size_t_)' [-fpermissive]
extern size_t iconv (iconv_t cd, const char_ * inbuf, size_t inbytesleft, cha
^
/usr/local/lib/R/etc/Makeconf:129: recipe for target 'Collector.o' failed
gmake: ** [Collector.o] Error 1
ERROR: compilation failed for package 'readr'

[hadley]

Gah, iconv is pain.

@jeroeonooms, any ideas? Maybe we need to check for the gnu compiler flag?

[hadley]

Duplicate of #149