SDL+freetype+SDL_ttf调用库出错

今天在移植好了SDL等库，链接了这三个库
MPI_LIBS += $(REL_LIB)/libSDL.a
MPI_LIBS += $(REL_LIB)/libSDL_ttf.a
MPI_LIBS += $(REL_LIB)/libfreetype.a

进行编译时候出现这样的错误提示，求各位帮看看
/mpp/lib/libfreetype.a(ftgzip.o): In function `ft_gzip_file_done':
/SDL/freetype-2.5.5/src/gzip/ftgzip.c:323: undefined reference to `inflateEnd'
/mpp/lib/libfreetype.a(ftgzip.o): In function `ft_gzip_file_fill_output':
/SDL/freetype-2.5.5/src/gzip/ftgzip.c:426: undefined reference to `inflate'
/mpp/lib/libfreetype.a(ftgzip.o): In function `ft_gzip_file_reset':
/SDL/freetype-2.5.5/src/gzip/ftgzip.c:352: undefined reference to `inflateReset'
/mpp/lib/libfreetype.a(ftgzip.o): In function `ft_gzip_file_init':
/SDL/freetype-2.5.5/src/gzip/ftgzip.c:308: undefined reference to `inflateInit2_'
/mpp/lib/libfreetype.a(ftgzip.o): In function `ft_gzip_file_done':
/SDL/freetype-2.5.5/src/gzip/ftgzip.c:323: undefined reference to `inflateEnd'
/mpp/lib/libfreetype.a(ftgzip.o): In function `FT_Gzip_Uncompress':
/SDL/freetype-2.5.5/src/gzip/ftgzip.c:728: undefined reference to `inflateInit2_'
/SDL/freetype-2.5.5/src/gzip/ftgzip.c:732: undefined reference to `inflate'
/SDL/freetype-2.5.5/src/gzip/ftgzip.c:735: undefined reference to `inflateEnd'
/SDL/freetype-2.5.5/src/gzip/ftgzip.c:743: undefined reference to `inflateEnd'