When compiling the CVS version and the 7.12.2 I get this error:

url.c:89:17: tld.h: No such file or directory
url.c: In function `tld_check_name':
url.c:2098: warning: implicit declaration of function `tld_check_lz'
url.c:2099: error: `TLD_INVALID' undeclared (first use in this function)
url.c:2099: error: (Each undeclared identifier is reported only once
url.c:2099: error: for each function it appears in.)
url.c:2108: error: `TLD_SUCCESS' undeclared (first use in this function)

It seems that the test for libidn is missing...

-- 
Jean-Philippe Barrette-LaPierre
Maintener of cURLpp (http://rrette.com/curlpp)