yes/lib cannot be found when (cross) compiling --with-jack support

When compiling "--with-jack" I get an error about a library called "yes":

libtool:   error: cannot determine absolute directory name of 'yes/lib'

ECA_S_EXTRA_CPPFLAGS =   -Iyes/include
-I/home/buildroot/buildroot-2018.02-rc3/output/host/bin/../arm-buildroot-linux-uclibcgnueabihf/sysroot/usr/include/liboil-0.3
 -I/home/buildroot/buildroot-2018.02-rc3/output/host/bin/../arm-buildroot-linux-uclibcgnueabihf/sysroot/usr/include

ECA_S_EXTRA_LIBS =   -lsamplerate -laudiofile -lsndfile -lasound -Lyes/lib
-ljack
-L/home/buildroot/buildroot-2018.02-rc3/output/host/bin/../arm-buildroot-linux-uclibcgnueabihf/sysroot/usr/lib
-loil-0.3 -lm -lrt
 -L/home/buildroot/buildroot-2018.02-rc3/output/host/bin/../arm-buildroot-linux-uclibcgnueabihf
/sysroot/usr/lib -llo -lpthread

ECA_S_JACK_INCLUDES = -Iyes/include
ECA_S_JACK_LIBS = -Lyes/lib -ljack

The fact that it's called yes doesn't make it easy to google ;-).
A 'find' made sure I didn't have this library, I'd get it if I knew
where.. What
is this thing???

thanks,
Sjoerd

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