I'm trying to follow the random train of thoughts that the alsa website calls instructions. (Did James Joyce write them?)
Anyway, I get to the point where I type
./configure --with-cards=opl3sa2 --with-sequencer=yes
everything seems O.K. though, except towards the end:
checking cross compile...
checking for directory with kernel source... /lib/modules/2.4.20-19.9/build
checking for kernel version... The file /lib/modules/2.4.20-19.9/build/include/linux/version.h does not exist.
Please, install the package with full kernel sources for your distribution
or use --with-kernel=dir option to specify another directory with kernel
sources (default is /usr/src/linux).
I haven't a clue what this means, or what to do about it. The first time I installed Linux, it detected the sound card and I didn't have to do a thing.