ERROR: "undefined reference to `agg::platform_support::platform_support(agg::pix_format_e, bool)" in Code::Blocks IDE

i'm building a project which use freetype and agg libs,

i'm sure i have added the libfreetype.so and libagg.a to the linker.

But there is also the ERROR :"undefined reference to `agg::platform_support::platform_supp开发者_C百科ort(agg::pix_format_e, bool)".

Any suggestion?TIA!