So nearly there, but can't install rJava

As ever, I learn from this: I didn't know apt-file. Got it, installed it, used it: 

root at DebianAdvent:/home/chris/Downloads/gmp-6.1.2# apt-file search jni.h 
android-libnativehelper-dev: /usr/include/android/nativehelper/jni.h 
android-platform-frameworks-native-headers: /usr/include/android/android/asset_manager_jni.h 
android-platform-frameworks-native-headers: /usr/include/android/android/native_window_jni.h 
gcj-6-jdk: /usr/lib/gcc/x86_64-linux-gnu/6/include/jni.h 
gcj-6-jdk: /usr/lib/jvm/java-1.5.0-gcj-6-amd64/include/jni.h 
libavcodec-dev: /usr/include/x86_64-linux-gnu/libavcodec/jni.h 
libgluegen2-build-java: /usr/share/gluegen2/make/stub_includes/jni/jni.h 
openjdk-8-jdk-headless: /usr/lib/jvm/java-8-openjdk-amd64/include/jni.h 

I was 99% sure I already had that last installed. Sure enough: 

root at DebianAdvent:/home/chris/Downloads/gmp-6.1.2# apt-get install openjdk-8-jdk-headless 
Reading package lists... Done 
Building dependency tree 
Reading state information... Done 
openjdk-8-jdk-headless is already the newest version (8u181-b13-2~deb9u1). 
openjdk-8-jdk-headless set to manually installed. 
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. 

Anyone else got any ideas? 

Chris

From: "Johannes Ranke" <johannes.ranke at jrwb.de>
To: "r-sig-debian" <r-sig-debian at r-project.org>, "Chris Evans"
<chrishold at psyctc.org>
Sent: Tuesday, 22 January, 2019 08:47:28
Subject: Re: [R-sig-Debian] So nearly there, but can't install rJava

Am Dienstag, 22. Januar 2019, 08:27:14 CET schrieb Chris Evans:

...

error: jni.h: No such file or directory

#include <jni.h>

^

compilation terminated.

You get a complaint that jni.h is missing. So one strategy would be to look for
this file in the available packages:

sudo apt-file search jni.h

One of the packages returned is openjdk-8-jdk-headless (which I happen to have
installed). I think (others will know for certain) that you need a Java
Development Kit (jdk) not just a runtime environment (jre).

Cheers,

Johannes

Chris Evans <chris at psyctc.org> Skype: chris-psyctc 
Visiting Professor, University of Sheffield <chris.evans at sheffield.ac.uk> 
I do some consultation work for the University of Roehampton <chris.evans at roehampton.ac.uk> and other places but this <chris at psyctc.org> remains my main Email address. 
I have "semigrated" to France, see: https://www.psyctc.org/pelerinage2016/semigrating-to-france/ if you want to book to talk, I am trying to keep that to Thursdays and my diary is now available at: https://www.psyctc.org/pelerinage2016/ecwd_calendar/calendar/ 
Beware: French time, generally an hour ahead of UK. That page will also take you to my blog which started with earlier joys in France and Spain! 

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