Failed to build Bitcoin Core from source, Ubuntu 17.10

Question

I'm building from source v0.16.0 on Ubuntu 17.10 I cloned the repo, checked out on v0.16.0, ran ./autogen.sh followed by ./configure CXXFLAGS="--param ggc-min-expand=1 --param ggc-min-heapsize=32768"

the make command however produces the following error:

Makefile:8224: recipe for target 'qt/qt_bitcoin_qt-bitcoin.o' failed
make[2]: *** [qt/qt_bitcoin_qt-bitcoin.o] Error 1
make[2]: Leaving directory '/home/angelag/src/bitcoin/src'
Makefile:9462: recipe for target 'all-recursive' failed
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory '/home/angelag/src/bitcoin/src'
Makefile:747: recipe for target 'all-recursive' failed
make: *** [all-recursive] Error 1

from the output of make command the errors started here:

...
...
CXX      qt/qt_bitcoin_qt-bitcoin.o
In file included from ./qt/paymentrequestplus.h:10:0,
                 from ./qt/paymentserver.h:35,
                 from qt/bitcoin.cpp:25:
./qt/paymentrequest.pb.h:12:2: error: #error This file was generated by a newer version of protoc which is
 #error This file was generated by a newer version of protoc which is
  ^~~~~
./qt/paymentrequest.pb.h:13:2: error: #error incompatible with your Protocol Buffer headers. Please update
 #error incompatible with your Protocol Buffer headers.  Please update
  ^~~~~
./qt/paymentrequest.pb.h:14:2: error: #error your headers.
 #error your headers.
  ^~~~~
...
...

Answer 1

That error means that protoc was updated since paymentrequest.pb.h was generated (it is not part of the source distribution, protoc generates it). Do make clean and then make. That should fix this error.