diff -Nurp guitarix-0.35.2.orig/src/LV2/gx_amp.lv2/gxamp.cpp guitarix-0.35.2.mod/src/LV2/gx_amp.lv2/gxamp.cpp
--- guitarix-0.35.2.orig/src/LV2/gx_amp.lv2/gxamp.cpp	2016-10-11 10:01:02.000000000 +0200
+++ guitarix-0.35.2.mod/src/LV2/gx_amp.lv2/gxamp.cpp	2017-02-19 00:17:58.519635549 +0100
@@ -235,19 +235,19 @@ private:
   volatile int32_t             schedule_wait;
 
   inline bool cab_changed() 
-    {return abs(cab - clevel_ ) > 0.1;}
+    {return std::abs(cab - clevel_ ) > 0.1;}
   inline bool buffsize_changed() 
-    {return abs(bufsize - cur_bufsize) != 0;}
+    {return bufsize != cur_bufsize;}
   inline void update_cab() 
     {cab = clevel_ ; c_old_model_ = c_model_;}
   inline bool change_cab() 
-    {return abs(c_old_model_ - c_model_) > 0.1;}
+    {return std::abs(c_old_model_ - c_model_) > 0.1;}
   inline bool pre_changed() 
-    {return abs(pre - alevel_) > 0.1;}
+    {return std::abs(pre - alevel_) > 0.1;}
   inline void update_pre() 
     {pre = (alevel_);}
   inline bool val_changed() 
-    {return  abs(alevel_ - (*alevel)) > 0.1 || abs(clevel_ - (*clevel)) > 0.1 || abs(c_model_ - (*c_model)) > 0.1;}
+    {return  std::abs(alevel_ - (*alevel)) > 0.1 || std::abs(clevel_ - (*clevel)) > 0.1 || std::abs(c_model_ - (*c_model)) > 0.1;}
 
   // LV2 stuff
   LV2_URID_Map*                map;
diff -Nurp guitarix-0.35.2.orig/src/LV2/gx_amp_stereo.lv2/gxamp_stereo.cpp guitarix-0.35.2.mod/src/LV2/gx_amp_stereo.lv2/gxamp_stereo.cpp
--- guitarix-0.35.2.orig/src/LV2/gx_amp_stereo.lv2/gxamp_stereo.cpp	2016-10-11 10:01:02.000000000 +0200
+++ guitarix-0.35.2.mod/src/LV2/gx_amp_stereo.lv2/gxamp_stereo.cpp	2017-02-19 00:18:20.624972976 +0100
@@ -235,19 +235,19 @@ private:
   volatile int32_t             schedule_wait;
   
   bool cab_changed()
-    {return abs(cab - clevel_ ) > 0.1;}
+    {return std::abs(cab - clevel_ ) > 0.1;}
   bool buffsize_changed() 
-    {return abs(bufsize - cur_bufsize) != 0;}
+    {return bufsize != cur_bufsize;}
   void update_cab()
     {cab = (clevel_ ); c_old_model_ = c_model_;}
   bool change_cab()
-    {return abs(c_old_model_ - c_model_) > 0.1;}
+    {return std::abs(c_old_model_ - c_model_) > 0.1;}
   bool pre_changed()
-    {return abs(pre - alevel_) > 0.1;}
+    {return std::abs(pre - alevel_) > 0.1;}
   void update_pre()
     {pre = (alevel_);}
   inline bool val_changed() 
-    {return  abs(alevel_ - (*alevel)) > 0.1 || abs(clevel_ - (*clevel)) > 0.1 || abs(c_model_ - (*c_model)) > 0.1;}
+    {return  std::abs(alevel_ - (*alevel)) > 0.1 || std::abs(clevel_ - (*clevel)) > 0.1 || std::abs(c_model_ - (*c_model)) > 0.1;}
 
   // LV2 stuff
   LV2_URID_Map*                map;
diff -Nurp guitarix-0.35.2.orig/src/LV2/gx_cabinet.lv2/gxcabinet.cpp guitarix-0.35.2.mod/src/LV2/gx_cabinet.lv2/gxcabinet.cpp
--- guitarix-0.35.2.orig/src/LV2/gx_cabinet.lv2/gxcabinet.cpp	2016-10-11 10:01:02.000000000 +0200
+++ guitarix-0.35.2.mod/src/LV2/gx_cabinet.lv2/gxcabinet.cpp	2017-02-19 00:17:18.791826329 +0100
@@ -106,15 +106,15 @@ private:
   volatile int32_t             schedule_wait;
 
   inline bool cab_changed() 
-    {return abs(cab_bass - cbass_) > 0.1 || abs(cab_treble - ctreble_) > 0.1 || abs(cab_level - clevel_) > 0.1;}
+    {return std::abs(cab_bass - cbass_) > 0.1 || std::abs(cab_treble - ctreble_) > 0.1 || std::abs(cab_level - clevel_) > 0.1;}
   inline bool buffsize_changed() 
-    {return abs(bufsize - cur_bufsize) != 0;}
+    {return bufsize != cur_bufsize;}
   inline void update_cab() 
     {cab_bass = cbass_; cab_treble = ctreble_; cab_level = clevel_; c_old_model_ = c_model_;}
   inline bool change_cab() 
-    {return abs(c_old_model_ - c_model_) > 0.1;}
+    {return std::abs(c_old_model_ - c_model_) > 0.1;}
   inline bool val_changed() 
-    {return abs(cbass_ - (*cbass)) > 0.1 || abs(ctreble_ != (*ctreble)) > 0.1 || abs(clevel_ != (*clevel)) > 0.1 ||  abs(c_model_ != (*c_model)) > 0.1;}
+    {return std::abs(cbass_ - (*cbass)) > 0.1 || std::abs(ctreble_ != (*ctreble)) > 0.1 || std::abs(clevel_ != (*clevel)) > 0.1 ||  std::abs(c_model_ != (*c_model)) > 0.1;}
 
   // LV2 stuff
   LV2_URID_Map*                map;