Missing dependency 'nice' while configuring libsoy

[nvlbg]

When I run ./waf configure, here's the output I get:

Setting top to : /home/nvlbg/Documents/code-in/apertium-eu-en-0.3.0/pysoy/libsoy Setting out to : /home/nvlbg/Documents/code-in/apertium-eu-en-0.3.0/pysoy/libsoy/build Checking for 'gcc' (c compiler) : /usr/bin/gcc Checking for program pkg-config : /usr/bin/pkg-config Checking for 'gobject-2.0' : yes Checking for 'gthread-2.0' : yes Checking for program valac-0.16 : /usr/bin/valac-0.16 Checking for valac-0.16 version >= (0, 11, 7) : (0, 16, 1) Checking for program orcc : /usr/bin/orcc Checking for 'ode' : yes Checking for 'bluez' : yes Checking for 'glesv1_cm' : yes Checking for 'dbus-glib-1' : yes Checking for 'gee-1.0' >= 0.5.0 : yes Checking for 'loudmouth-1.0' >= 1.0 : yes Checking for 'nice' >= 0.1 : not found The configuration failed (complete log in /home/nvlbg/Documents/code-in/apertium-eu-en-0.3.0/pysoy/libsoy/build/config.log)