Compiling error on Gentoo

[Pavel-Guseynov]

mapnik:2.1.0
ruby: 1.9.3p385

Building native extensions.  This could take a while...
ERROR:  Error installing ruby_mapnik:
        ERROR: Failed to build gem native extension.

        /usr/bin/ruby19 extconf.rb
checking for main() in -lrice... yes
creating Makefile

make
compiling _mapnik_text_symbolizer.rb.cpp
_mapnik_text_symbolizer.rb.cpp: In function 'Rice::Object<unnamed>::get_text_displacement(const mapnik::text_symbolizer&)':
_mapnik_text_symbolizer.rb.cpp:37:47: warning: 'const mapnik::position& mapnik::text_symbolizer::get_displacement() const' is deprecated (declared at /usr/include/mapnik/text_symbolizer.hpp:109)
_mapnik_text_symbolizer.rb.cpp: In function 'mapnik::horizontal_alignment<unnamed>::get_text_horizontal_alignment(const mapnik::text_symbolizer&)':
_mapnik_text_symbolizer.rb.cpp:52:76: warning: 'mapnik::horizontal_alignment_e mapnik::text_symbolizer::get_horizontal_alignment() const' is deprecated (declared at /usr/include/mapnik/text_symbolizer.hpp:125)
_mapnik_text_symbolizer.rb.cpp: In function 'mapnik::justify_alignment<unnamed>::get_text_justify_alignment(const mapnik::text_symbolizer&)':
_mapnik_text_symbolizer.rb.cpp:61:70: warning: 'mapnik::justify_alignment_e mapnik::text_symbolizer::get_justify_alignment() const' is deprecated (declared at /usr/include/mapnik/text_symbolizer.hpp:127)
_mapnik_text_symbolizer.rb.cpp: In function 'mapnik::label_placement_enum<unnamed>::get_text_label_placement(const mapnik::text_symbolizer&)':
_mapnik_text_symbolizer.rb.cpp:70:71: warning: 'mapnik::label_placement_e mapnik::text_symbolizer::get_label_placement() const' is deprecated (declared at /usr/include/mapnik/text_symbolizer.hpp:104)
_mapnik_text_symbolizer.rb.cpp: In function 'mapnik::text_transform<unnamed>::get_text_transform(const mapnik::text_symbolizer&)':
_mapnik_text_symbolizer.rb.cpp:79:64: warning: 'mapnik::text_transform_e mapnik::text_symbolizer::get_text_transform() const' is deprecated (declared at /usr/include/mapnik/text_symbolizer.hpp:77)
_mapnik_text_symbolizer.rb.cpp: In function 'mapnik::vertical_alignment<unnamed>::get_vertical_alignment(const mapnik::text_symbolizer&)':
_mapnik_text_symbolizer.rb.cpp:88:72: warning: 'mapnik::vertical_alignment_e mapnik::text_symbolizer::get_vertical_alignment() const' is deprecated (declared at /usr/include/mapnik/text_symbolizer.hpp:106)
compiling _mapnik.cpp
compiling _mapnik_point_symbolizer.rb.cpp
compiling _mapnik_layer.rb.cpp
compiling _mapnik_projection.rb.cpp
compiling _mapnik_font_engine.rb.cpp
compiling _mapnik_datasource_cache.rb.cpp
compiling _mapnik_shield_symbolizer.rb.cpp
compiling _mapnik_datasource.rb.cpp
_mapnik_datasource.rb.cpp: In member function 'Rice::Object<unnamed>::mapnik_value_holder_to_ruby_visitor::operator()(const mapnik::value_null&) const':
_mapnik_datasource.rb.cpp:56:13: warning: passing NULL to non-pointer argument 1 of 'Rice::Object::Object(VALUE)'
compiling _mapnik_polygon_pattern_symbolizer.rb.cpp
compiling _mapnik_stroke.rb.cpp
compiling _mapnik_raster_symbolizer.rb.cpp
compiling _mapnik_coord.rb.cpp
compiling _mapnik_map.rb.cpp
compiling _mapnik_expression.rb.cpp
compiling _mapnik_polygon_symbolizer.rb.cpp
compiling _mapnik_style.rb.cpp
compiling _mapnik_markers_symbolizer.rb.cpp
compiling _mapnik_envelope.rb.cpp
compiling ruby_mapnik.cpp
compiling _mapnik_rule.rb.cpp
compiling _mapnik_raster_colorizer.rb.cpp
compiling _mapnik_line_symbolizer.rb.cpp
compiling _mapnik_line_pattern_symbolizer.rb.cpp
compiling _mapnik_feature.rb.cpp
compiling _mapnik_symbolizer.rb.cpp
compiling _mapnik_color.rb.cpp
linking shared-object ruby_mapnik/ruby_mapnik.so
_mapnik_map.rb.o: In function `render_to_cairo_surface':
/usr/local/lib64/ruby/gems/1.9.1/gems/ruby_mapnik-0.1.5/ext/ruby_mapnik/_mapnik_map.rb.cpp:146: undefined reference to `Cairo::Surface::Surface(_cairo_surface*, bool)'
_mapnik_map.rb.o: In function `render_to_cairo_context':
/usr/local/lib64/ruby/gems/1.9.1/gems/ruby_mapnik-0.1.5/ext/ruby_mapnik/_mapnik_map.rb.cpp:153: undefined reference to `Cairo::Context::Context(_cairo*, bool)'
_mapnik_rule.rb.o: In function `~regex_replace_node':
/usr/include/mapnik/expression_node.hpp:253: undefined reference to `icu_49::UnicodeString::~UnicodeString()'
_mapnik_feature.rb.o: In function `internal_visit<icu_49::UnicodeString>':
/usr/include/boost-1_49/boost/variant/variant.hpp:426: undefined reference to `icu_49::UnicodeString::UnicodeString(icu_49::UnicodeString const&)'
_mapnik_feature.rb.o: In function `to_utf8':
/usr/include/mapnik/value.hpp:57: undefined reference to `u_strToUTF8_49'
/usr/include/mapnik/value.hpp:62: undefined reference to `u_strToUTF8_49'
collect2: ld returned 1 exit status
make: *** [ruby_mapnik.so] Error 1