portmidi install attempt error - help?

.out

[2022-07-26 17:54:06] gene@mopey:~/Downloads/portmidi 
▸ make
Consolidate compiler generated dependencies of target portmidi
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[ 74%] Building C object pm_java/CMakeFiles/pmjni.dir/pmjni/pmjni.c.o
In file included from /home/gene/Downloads/portmidi/pm_java/pmjni/pmjni.c:3:
/home/gene/Downloads/portmidi/pm_java/pmjni/jportmidi_JportMidiApi.h:2:10: fatal error: jni.h: No such file or directory
    2 | #include <jni.h>
      |          ^~~~~~~
compilation terminated.
make[2]: *** [pm_java/CMakeFiles/pmjni.dir/build.make:76: pm_java/CMakeFiles/pmjni.dir/pmjni/pmjni.c.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:578: pm_java/CMakeFiles/pmjni.dir/all] Error 2
make: *** [Makefile:136: all] Error 2