Final stage linking error: plugin_start_addr

[powerpan]

LD vorbis.codec
/rockbox-3.8.1/build/apps/codecs/vorbis.o:(.header+0x8): undefined reference to `plugin_start_addr'
/rockbox-3.8.1/build/apps/codecs/vorbis.o:(.header+0xc): undefined reference to `plugin_end_addr'
/rockbox-3.8.1/build/apps/codecs/codec_crt0.o: In function `codec_start':
codec_crt0.c:(.text+0x5c): undefined reference to `plugin_bss_start'
codec_crt0.c:(.text+0x60): undefined reference to `plugin_end_addr'
collect2: ld returned 1 exit status


where did those undifined reference defined? anybody could help?

[powerpan]

mark all the codes with errors,

but 456MH arm 9 could not decode ape_c4000 under linux