Something broke

[Jone]

#> speaker-test
   Cannot open shared library
   /gnu/store/..-alsa-lib-1.1.6/lib/alsa-lib/libasound_module_pcm_equal.so

I do not know how it happened, but apparently this:
libasound_module_pcm_equal.so -> alsaequal

Ok, build alsaequal (I really need an equalizer):

install: target '/usr/lib/alsa-lib/' is not a directory: No such file or
directory

See Makefile:
6 install: all
47     @echo Installing...
48     $(Q)install -m 644 $(SND_PCM_BIN) ${DESTDIR}/usr/lib/alsa-lib/

1. need some magic with install
2. or?

I looked at the linux.scm, there is a variable ALSA_PLUGIN_DIR, but?
Or advise a good book on the build of the source code.