Can't compile on raspbian buster (4.19)

I'm getting the following when I try to run make:

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pi@raspberrypi:~/Downloads/harmonySEQ-0.16 $ make
Making all in po
make[1]: Entering directory '/home/pi/Downloads/harmonySEQ-0.16/po'
make[1]: Leaving directory '/home/pi/Downloads/harmonySEQ-0.16/po'
Making all in examples
make[1]: Entering directory '/home/pi/Downloads/harmonySEQ-0.16/examples'
make[1]: Nothing to be done for 'all'.
make[1]: Leaving directory '/home/pi/Downloads/harmonySEQ-0.16/examples'
Making all in pixmaps
make[1]: Entering directory '/home/pi/Downloads/harmonySEQ-0.16/pixmaps'
make[1]: Nothing to be done for 'all'.
make[1]: Leaving directory '/home/pi/Downloads/harmonySEQ-0.16/pixmaps'
Making all in src
make[1]: Entering directory '/home/pi/Downloads/harmonySEQ-0.16/src'
make all-am
make[2]: Entering directory '/home/pi/Downloads/harmonySEQ-0.16/src'
g++ -DLOCALEDIR=\"/usr/local/share/locale\" -DHAVE_CONFIG_H -I. -pthread -I/usr/include/gtkmm-2.4 -I/usr/lib/arm-linux-gnueabihf/gtkmm-2.4/include -I/usr/include/atkmm-1.6 -I/usr/include/gtk-unix-print-2.0 -I/usr/include/gtk-2.0 -I/usr/include/gdkmm-2.4 -I/usr/lib/arm-linux-gnueabihf/gdkmm-2.4/include -I/usr/include/giomm-2.4 -I/usr/lib/arm-linux-gnueabihf/giomm-2.4/include -I/usr/include/pangomm-1.4 -I/usr/lib/arm-linux-gnueabihf/pangomm-1.4/include -I/usr/include/glibmm-2.4 -I/usr/lib/arm-linux-gnueabihf/glibmm-2.4/include -I/usr/include/cairomm-1.0 -I/usr/lib/arm-linux-gnueabihf/cairomm-1.0/include -I/usr/include/sigc++-2.0 -I/usr/lib/arm-linux-gnueabihf/sigc++-2.0/include -I/usr/include/gtk-2.0 -I/usr/lib/arm-linux-gnueabihf/gtk-2.0/include -I/usr/include/gio-unix-2.0 -I/usr/include/cairo -I/usr/include/pango-1.0 -I/usr/include/atk-1.0 -I/usr/include/cairo -I/usr/include/pixman-1 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/libmount -I/usr/include/blkid -I/usr/include/pango-1.0 -I/usr/include/harfbuzz -I/usr/include/pango-1.0 -I/usr/include/fribidi -I/usr/include/glib-2.0 -I/usr/lib/arm-linux-gnueabihf/glib-2.0/include -I/usr/include/uuid -I/usr/include/freetype2 -I/usr/include/libpng16 -Wall -O3 -O3 -MT harmonySEQ-Files.o -MD -MP -MF .deps/harmonySEQ-Files.Tpo -c -o harmonySEQ-Files.o `test -f 'Files.cpp' || echo './'`Files.cpp
In file included from Files.cpp:21:
Files.h:48:32: error: ‘KeyFile’ is not a member of ‘Glib’
     bool LoadFileCurrent(Glib::KeyFile* kf);
                                ^~~~~~~
Files.h:48:41: error: ‘kf’ was not declared in this scope
     bool LoadFileCurrent(Glib::KeyFile* kf);
                                         ^~
Files.h:50:41: error: ‘KeyFile’ is not a member of ‘Glib’
     bool ConvertFile_0_15_to_0_16(Glib::KeyFile* kf);
                                         ^~~~~~~
Files.h:50:50: error: ‘kf’ was not declared in this scope
     bool ConvertFile_0_15_to_0_16(Glib::KeyFile* kf);
                                                  ^~
Files.cpp: In function ‘bool Files::LoadFile(Glib::ustring)’:
Files.cpp:145:24: warning: catching polymorphic type ‘class Glib::Error’ by value [-Wcatch-value=]
     }catch(Glib::Error e){
                        ^
Files.cpp:183:54: error: ‘Files::ConvertFile_0_15_to_0_16’ cannot be used as a function
                 e_flag = ConvertFile_0_15_to_0_16(&kf);
                                                      ^
Files.cpp:192:45: error: ‘Files::LoadFileCurrent’ cannot be used as a function
                 e_flag = LoadFileCurrent(&kf);
                                             ^
Files.cpp:219:31: warning: catching polymorphic type ‘class Glib::KeyFileError’ by value [-Wcatch-value=]
     }catch(Glib::KeyFileError e){
                               ^
Files.cpp:227:24: warning: catching polymorphic type ‘class Glib::Error’ by value [-Wcatch-value=]
     }catch(Glib::Error e){
                        ^
Files.cpp: At global scope:
Files.cpp:387:40: error: ‘bool Files::LoadFileCurrent(Glib::KeyFile*)’ redeclared as different kind of symbol
 bool LoadFileCurrent(Glib::KeyFile* kfp){
                                        ^
In file included from Files.cpp:21:
Files.h:48:10: note: previous declaration ‘bool Files::LoadFileCurrent’
     bool LoadFileCurrent(Glib::KeyFile* kf);
          ^~~~~~~~~~~~~~~
Files.cpp:588:49: error: ‘bool Files::ConvertFile_0_15_to_0_16(Glib::KeyFile*)’ redeclared as different kind of symbol
 bool ConvertFile_0_15_to_0_16(Glib::KeyFile* kfp){
                                                 ^
In file included from Files.cpp:21:
Files.h:50:10: note: previous declaration ‘bool Files::ConvertFile_0_15_to_0_16’
     bool ConvertFile_0_15_to_0_16(Glib::KeyFile* kf);
          ^~~~~~~~~~~~~~~~~~~~~~~~
Files.cpp:662:1: fatal error: opening dependency file .deps/harmonySEQ-Files.Tpo: Permission denied
 }//namespace files
 ^
compilation terminated.
make[2]: *** [Makefile:475: harmonySEQ-Files.o] Error 1
make[2]: Leaving directory '/home/pi/Downloads/harmonySEQ-0.16/src'
make[1]: *** [Makefile:263: all] Error 2
make[1]: Leaving directory '/home/pi/Downloads/harmonySEQ-0.16/src'
make: *** [Makefile:348: all-recursive] Error 1
pi@raspberrypi:~/Downloads/harmonySEQ-0.16 $
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Any ideas?
I've already tried this:
https://code.launchpad.net/~philipchung1995/harmonyseq/code-fixes