sudo apt-get install build-essential will fix it.
Thanks you so much!
I still don't know what caused everything to turn bad.
Dear Technical support.
when upgrade my forum v1.9.1 to v.1.9.2 is error.
the notice is : Upgrade complete but check version again :
but show old version v1.9.1
How i can upgrade to v1.9.2
Thank you Sir.
You must run
git pull before running