编译opencv3.1.0时报错unable to find a javc compiler

build.xml:278: Unable to find a javac compiler;
com.sun.tools.javac.Main is not on the classpath.
Perhaps JAVA_HOME does not point to the JDK.
It is currently set to "/usr/lib/jvm/java-1.8.0-openjdk-amd64"

怎么可能？明明我把$JAVA_HOME设为/usr/lib/jvm/jdk1.7.0_79的。

我到/usr/lib/jvm下面去看看，到底怎么回事。

root@wzy-pc:/usr/lib/jvm# ll
总用量 28
drwxr-xr-x   4 root root  4096 7月  13 18:01 ./
drwxr-xr-x 165 root root 12288 7月  13 14:31 ../
lrwxrwxrwx   1 root root    12 7月  13 18:01 default-java -> java-1.8.0-openjdk-amd64 //
lrwxrwxrwx   1 root root    20 4月  23 16:26 java-1.8.0-openjdk-amd64 -> java-8-openjdk-amd64/
-rw-r--r--   1 root root  2600 4月  23 16:26 .java-1.8.0-openjdk-amd64.jinfo
drwxr-xr-x   5 root root  4096 7月  13 18:00 java-8-openjdk-amd64/
drwxr-xr-x   8 root root  4096 7月  11 14:00 jdk1.7.0_79/

原来有个default-java这个东西，赶集改掉：

sudo ln -s jdk1.7.0_79 default-java

这样就好了

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编译opencv3.1.0时报错unable to find a javc compiler

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