
The last few lines of the log contain a syntax error which seems to be the cause of the failure. I know Centos 7 is not supported but wanted to post what I found FWIW. It failed building the main Guest Addition module. All went well until I tried to install the Guest Additions.

For fun today I tried installing Centos 7 on VB 4.3.12 r93733 on host Mac OS X.9.4.
