Problems in building libre-office

Hi everyone,

There are some issues with my pc. It can run continually for only 2-3
hours. After that it shuts down on its own.

I was trying to build libre-office on my pc.
It ran for 3 hours and then it switched off.
At that time make 2>&1 command was running.

The last lines before shutting off pc on cygwin were as follows :
[build C] UnpackedTarball/expect/lib/xmlrole_x64.c
c1 : command line warning D9025 : overriding '/D_X86_=1' with '/U_X86_'

[build MOD] glm
c1 : command line warning D9025 : overriding '/D_X86_=1' with '/U_X86_'
[build MOD] mdds

After the pc restarted I ran make 2>&1 command again.
It gave the following error:
make[1] = ***Waiting for unfinished jobs...
make : *** [Makefile : 282 : build] Error 2

I have spend a lot of time building libre-office upto this stage and am not
willing to rerun the whole process again.
Is there a way out?

Anshu