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$make -j3 (tail output)
/usr/bin/ld: /usr/lib64/gcc/x86_64-slackware-linux/7.3.0/../../../../lib64/libavutil.a(eval.o): undefined reference to symbol 'acos@@GLIBC_2.2.5'
/lib64/libm.so.6: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status
make[2]: *** [Makefile:584: guacenc] Error 1
make[2]: Leaving directory '/home/setup/programs/geral/guacamole-0.9.14/guacamole-server-master/src/guacenc'
make[1]: *** [Makefile:513: all-recursive] Error 1
make[1]: Leaving directory '/home/setup/programs/geral/guacamole-0.9.14/guacamole-server-master'
make: *** [Makefile:435: all] Error 2