psi-plugins is a small collection of LV2 plugins ideal for (but not limited to) electronic music. It uses the ntk widget library (possibly provided by your distribution as non-ntk-devel/ntk-dev)
They are:
__super_welle__: a 4 oscillator / 16 voice virtual analog unison synthesizer
__midi_gate__: an enveloped stereo MIDI gate
__sidechain_gate__: stereo sidechain gate (with hysteresis) based on Steve Harris's Gate plugin
__midi_rnd__: MIDI randomizer. Randomize incoming MIDI within a range, or relative within an octave range.
./waf configure
./waf
sudo ./waf install
To specify a custom prefix and/or LV2 directory:
./waf configure --prefix=/usr --lv2dir=/usr/lib64/lv2
./waf
sudo ./waf install