Running ./configure reports:
checking iconv.h usability... yes
checking iconv.h presence... yes
checking for iconv.h... yes
checking for library containing iconv_open... none required
On my system I have /usr/include/iconv.h from libc and /usr/local/include/iconv.h from libiconv-1.15 . The latter contains "#define iconv_open libiconv_open". This file is included in src/common/isc_file.cpp and there the latter macro is expanded. So isc_file.cpp references libiconv_open(). For this to work -liconv must be passed to the linker, but it is not. In turn linking towards common.a(isc_files.cpp) fails, as libiconv_open() cannot be resolved.