Run partipanel.fl through 1.34 version of fluid. doesn't change anything important.

src/partipanel.H

-// generated by Fast Light User Interface Designer (fluid) version 1.0300
+// generated by Fast Light User Interface Designer (fluid) version 1.0304
 
 #ifndef partipanel_H
 #define partipanel_H

src/partipanel.cc

-// generated by Fast Light User Interface Designer (fluid) version 1.0300
+// generated by Fast Light User Interface Designer (fluid) version 1.0304
 
 #include "partipanel.H"
 #include "partiview.H"
 
 Fl_Menu_Item menu_ppui[] = {
- {"inertia", 0,  (Fl_Callback*)pp_inertia_on_cb, 0, 2, FL_NORMAL_LABEL, 0, 12, 3},
- {"H-R Diagram", 0,  (Fl_Callback*)pp_hrdiag_on_cb, 0, 2, FL_NORMAL_LABEL, 0, 14, 3},
+ {"inertia", 0,  (Fl_Callback*)pp_inertia_on_cb, 0, 2, (uchar)FL_NORMAL_LABEL, 0, 12, 3},
+ {"H-R Diagram", 0,  (Fl_Callback*)pp_hrdiag_on_cb, 0, 2, (uchar)FL_NORMAL_LABEL, 0, 14, 3},
  {0,0,0,0,0,0,0,0,0}
 };