Error message:

In file included from /usr/include/stdio.h:937:0,
                 from zbar/debug.h:60,
                 from zbar/scanner.c:34:
/usr/include/x86_64-linux-gnu/bits/stdio2.h:140:1: error: expected identifier or ‘(’ before ‘{’ token

First, in execution/ When configuring, pay attention to the final output result to ensure that the normal execution is completed. The normal completion should have no error character, for example:

...
configure: creating ./config.status
config.status: creating Makefile
config.status: creating zbar.pc
config.status: creating zbar-gtk.pc
config.status: creating zbar-qt.pc
config.status: creating doc/doxygen.conf
config.status: creating include/config.h
config.status: executing depfiles commands
config.status: executing libtool commands
config.status: executing doc/version.xml commands
config.status: executing doc/reldate.xml commands

please verify that the detected configuration matches your expectations:
------------------------------------------------------------------------
X                 --with-x=yes
pthreads          --enable-pthread=yes
v4l               --enable-video=no
        => zbarcam video scanner will *NOT* be built
jpeg              --with-jpeg=yes
Magick++          --with-imagemagick=yes
Python            --with-python=no
GTK+              --with-gtk=yes
        => the PyGTK widget wrapper will *NOT* be built
Qt4               --with-qt=no
        => the Qt4 widget will *NOT* be built

If the message is unable to find ImageMagick, install ImageMagick and libmagickwand dev

apt-get install imagemagick libmagickwand-dev

If: error: no suitable Python interpreter found

Note: there is no Python environment or the required versions of existing Python and ZBar are inconsistent. If Python is not involved, add the parameter — without python

If: configure: error: Test for video support failed
rebuild your kernel to include video4linux support or
configure –disable-video to skip building video support.

Add — Disable video parameter

For example, my final execution /Configure parameter:

./configure FLAGS="" --disable-video --without-python --without-qt