In my enviroment, wavesurfer startup failed. [ts@localhost Downloads]$ uname --a Linux localhost.localdomain 3.10.0-514.26.2.el7.x86_64 #1 SMP Tue Jul 4 15:04:05 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux [ts@localhost Downloads]$ ./wavesurfer couldn't load file "/tmp/tcl_PX2nXx": libXft.so.2: cannot open shared object file: No such file or directory while executing "load /home/ts/Downloads/wavesurfer/lib/tk8.6/libtk8.6.so Tk" ("package ifneeded Tk 8.6.6" script) invoked from within "package require...