[Vorbis] compile error

[R McGlue]

king all in vorbisfile
make[2]: Entering directory `/home/ronan/libvorbis-1.0.1/doc/vorbisfile'
make[2]: Nothing to be done for `all'.
make[2]: Leaving directory `/home/ronan/libvorbis-1.0.1/doc/vorbisfile'
Making all in vorbisenc
make[2]: Entering directory `/home/ronan/libvorbis-1.0.1/doc/vorbisenc'
make[2]: Nothing to be done for `all'.
make[2]: Leaving directory `/home/ronan/libvorbis-1.0.1/doc/vorbisenc'
make[2]: Entering directory `/home/ronan/libvorbis-1.0.1/doc'
make[2]: Nothing to be done for `all-am'.
make[2]: Leaving directory `/home/ronan/libvorbis-1.0.1/doc'
make[1]: Leaving directory `/home/ronan/libvorbis-1.0.1/doc'
Making all in examples
make[1]: Entering directory `/home/ronan/libvorbis-1.0.1/examples'
/bin/sh ../libtool --mode=link gcc  -O20 -ffast-math -mno-ieee-fp 
-D_REENTRANT -fsigned-char  -DUSE_MEMORY_H -all-static -o 
decoder_example  decoder_example.o ../lib/libvorbis.la -lm  -logg
gcc -O20 -ffast-math -mno-ieee-fp -D_REENTRANT -fsigned-char 
-DUSE_MEMORY_H -static -o decoder_example decoder_example.o 
../lib/.libs/libvorbis.a -lm /usr/lib/libogg.a
/usr/bin/ld: cannot find -lm
collect2: ld returned 1 exit status
make[1]: *** [decoder_example] Error 1
make[1]: Leaving directory `/home/ronan/libvorbis-1.0.1/examples'
make: *** [all-recursive] Error 1
[ronan at a9015 libvorbis-1.0.1]$ which ld
/usr/bin/ld
[ronan at a9015 libvorbis-1.0.1]$

anyone come accross this before?

ronan