Build failed (missing pugl)

tried running make and it failed

make -C dpf/dgl ../build/libdgl-cairo.a
make[1]: Entering directory '/home/reed/Desktop/string-machine/dpf/dgl'
Compiling src/ApplicationPrivateData.cpp
In file included from src/ApplicationPrivateData.cpp:20:
src/pugl.hpp:44:10: fatal error: pugl-upstream/include/pugl/pugl.h: No such file or directory
   44 | #include "pugl-upstream/include/pugl/pugl.h"
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
make[1]: *** [Makefile:180: ../build/dgl/ApplicationPrivateData.cpp.o] Error 1
make[1]: Leaving directory '/home/reed/Desktop/string-machine/dpf/dgl'
make: *** [Makefile:26: dgl] Error 2

I already have libpugl-dev installed. Using Ubuntu 22.04.

[kassoulet]

You have to use git submodule update --init --recursive before make.