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Eclipse PDT on Debian Stetch desktop

For some reason, I have started learning PHP development.

Yesterday, I downloaded a new version of Eclipse PDT, which is called Photon.
For I would like to experience the IDE's debugging support, I installed PHP's xdebug module with the Debian package before hand, 


I extracted the Eclipse distribution tarball below the /usr/local directory, and launched it. It seemed work fine, but when I tried several functions of "Debug" menu, some didn't. I could mark a breakpoint in my very short PHP script, but I could not run the script nor make it stalled on the breakpoint.
Instead, the eclipse show me a dialog box with an error message related to gObject.


Today, I downloaded the prior version, Oxygen, of Eclipse PDT, and did the same thing as yesterday. Yes, "Debug" menu functions seemed to work fine this time.

I guess my desktop environment of Debian 9 (Strctch) is not ready for the latest version of the Eclipse SWT, but I think it is the way the Debian stable is as usual.

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