The problem is in Makefile.am in nmixer. The line that reads LDADD = @NCURSES_LIBS@ @NAS_LIBS@ @LIBNMIXER@ should read LDADD = @LIBNMIXER@ @NCURSES_LIBS@ @NAS_LIBS@.
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here is there output, someone who got an idea ?
mipsel-linux-g++ -g -O2 -L/share/ncurses/lib -L../mpegsound -L../nmixer -o nmixer main.o -lncurses -lnmixer -lpthread -lm -lpthread
../nmixer/libnmixer.a(nmixer.o):/root/popcorn/smp/mp3blaster-3.2.5/nmixer/nmixer.cc:539: undefined reference to `wchgat'
../nmixer/libnmixer.a(nmixer.o):/root/popcorn/smp/mp3blaster-3.2.5/nmixer/nmixer.cc:540: undefined reference to `wchgat'
../nmixer/libnmixer.a(nmixer.o):/root/popcorn/smp/mp3blaster-3.2.5/nmixer/nmixer.cc:541: undefined reference to `wchgat'
../nmixer/libnmixer.a(nmixer.o):/root/popcorn/smp/mp3blaster-3.2.5/nmixer/nmixer.cc:542: undefined reference to `wchgat'
../nmixer/libnmixer.a(nmixer.o):/root/popcorn/smp/mp3blaster-3.2.5/nmixer/nmixer.cc:544: undefined reference to `wchgat'
../nmixer/libnmixer.a(nmixer.o):/root/popcorn/smp/mp3blaster-3.2.5/nmixer/nmixer.cc:545: more undefined references to `wchgat' follow
../nmixer/libnmixer.a(nmixer.o):/root/popcorn/smp/mp3blaster-3.2.5/nmixer/nmixer.cc:292: undefined reference to `move'
../nmixer/libnmixer.a(nmixer.o):/root/popcorn/smp/mp3blaster-3.2.5/nmixer/nmixer.cc:243: undefined reference to `wchgat'
../nmixer/libnmixer.a(nmixer.o):/root/popcorn/smp/mp3blaster-3.2.5/nmixer/nmixer.cc:233: undefined reference to `wchgat'
../nmixer/libnmixer.a(nmixer.o):/root/popcorn/smp/mp3blaster-3.2.5/nmixer/nmixer.cc:222: undefined reference to `wchgat'
../nmixer/libnmixer.a(nmixer.o):/root/popcorn/smp/mp3blaster-3.2.5/nmixer/nmixer.cc:287: undefined reference to `wchgat'
collect2: ld returned 1 exit status
make[1]: *** [nmixer] Error 1
make[1]: Leaving directory `/root/popcorn/smp/mp3blaster-3.2.5/nmixer'
make: *** [install-recursive] Error 1
The problem is in Makefile.am in nmixer. The line that reads LDADD = @NCURSES_LIBS@ @NAS_LIBS@ @LIBNMIXER@ should read LDADD = @LIBNMIXER@ @NCURSES_LIBS@ @NAS_LIBS@.
Try the patch in <https://sourceforge.net/tracker/?func=detail&atid=792727&aid=2714469&group_id=154673>.