last part of build log showing the error

ecasound.log (text/plain), 858 bytes, created by John Covici on 2017-12-19 22:33:43 UTC

libtool: link: x86_64-pc-linux-gnu-g++ -ffast-math -fstrict-aliasing -DNDEBUG -DENABLE_DBC -O2 -mtune=core2 -pipe -ggdb -Wl,-O1 -o .libs/ecasound ecasound.o eca-curses.o eca-comhelp.o eca-neteci-server.o eca-plaintext.o textdebug.o -Wl,--export-dynamic  -Wl,--as-needed -lncurses -lreadline -lhistory ../libecasound/.libs/libecasound.so -lsamplerate -lasound ../kvutils/.libs/libkvutils.so -ldl -lm -lpthread
/usr/lib/gcc/x86_64-pc-linux-gnu/6.4.0/../../../../x86_64-pc-linux-gnu/bin/ld: eca-curses.o: undefined reference to symbol 'COLS'
/lib64/libtinfo.so.6: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status
make[2]: *** [Makefile:484: ecasound] Error 1
make[2]: Leaving directory '/var/tmp/portage/media-sound/ecasound-2.9.1-r1/work/ecasound-2.9.1/ecasound'
make[1]: *** [Makefile:438: all-recursive] Error 1