diff --git a/plugins/zynaddsubfx/src/UI/BankUI.cc b/plugins/zynaddsubfx/src/UI/BankUI.cc
index 7c8331d34..ac976f873 100644
--- a/plugins/zynaddsubfx/src/UI/BankUI.cc
+++ b/plugins/zynaddsubfx/src/UI/BankUI.cc
@@ -4,6 +4,9 @@
 //Copyright (c) 2002-2005 Nasca Octavian Paul
 //License: GNU GPL version 2 or later
 
+void BankProcess_::process() {
+}
+
 BankSlot::BankSlot(int x,int y, int w, int h, const char *label):Fl_Button(x,y,w,h,label) {
   what=NULL;
 whatslot=NULL;
diff --git a/plugins/zynaddsubfx/src/UI/OscilGenUI.cc b/plugins/zynaddsubfx/src/UI/OscilGenUI.cc
index 879ff763b..7bcb5ad3e 100644
--- a/plugins/zynaddsubfx/src/UI/OscilGenUI.cc
+++ b/plugins/zynaddsubfx/src/UI/OscilGenUI.cc
@@ -80,6 +80,9 @@ for (i=0;i<n;i++){
 delete [] spc;
 }
 
+PSlider::PSlider(int x,int y, int w, int h, const char *label):Fl_Slider(x,y,w,h,label) {
+}
+
 int PSlider::handle(int event) {
   int X=x(),Y=y(),W=w(),H=h();
 
diff --git a/plugins/zynaddsubfx/src/UI/PartUI.cc b/plugins/zynaddsubfx/src/UI/PartUI.cc
index 00c5c60d2..f25571165 100644
--- a/plugins/zynaddsubfx/src/UI/PartUI.cc
+++ b/plugins/zynaddsubfx/src/UI/PartUI.cc
@@ -65,6 +65,9 @@ PartSysEffSend::~PartSysEffSend() {
 //delete(syseffsend);
 }
 
+void PartUI_::showparameters(int kititem,int engine) {
+}
+
 void PartKitItem::cb_minkcounter_i(Fl_Counter* o, void*) {
   part->kit[n].Pminkey=(int)o->value();
 }
diff --git a/plugins/zynaddsubfx/src/UI/PresetsUI.cc b/plugins/zynaddsubfx/src/UI/PresetsUI.cc
index 16022104c..b35c868f3 100644
--- a/plugins/zynaddsubfx/src/UI/PresetsUI.cc
+++ b/plugins/zynaddsubfx/src/UI/PresetsUI.cc
@@ -2,6 +2,12 @@
 
 #include "PresetsUI.h"
 
+void PresetsUI_::refresh() {
+}
+
+PresetsUI_::~PresetsUI_() {
+}
+
 void PresetsUI::cb_copybrowse_i(Fl_Browser* o, void*) {
   int val=o->value();
 if (val!=0){