A video4linux framegrabber Code

Use AM_INIT_AUTOMAKE: with no argument

configure.ac:27: warning: AM_INIT_AUTOMAKE: two- and three-arguments forms are deprecated. For more info, see:
configure.ac:27: http://www.gnu.org/software/automake/manual/automake.html#Modernize-AM_005fINIT_005fAUTOMAKE-invocation@

Rename configure.in in configure.ac

aclocal: warning: autoconf input should be named 'configure.ac', not 'configure.in'
automake: warning: autoconf input should be named 'configure.ac', not 'configure.in'

Do not install the vgrabbj.conf.default file

Defaults values should already be used by the program.

Remove useless line defining DEFAULT_CONFIG_FILE

Use ${sysconfdir} if prefix is set

${sysconfdir} default to ${prefix}/etc but can be overwrittent by
--sysconfdir=dir

Fix autoheader warning

autoheader: warning: missing template: SYSCONF_DIR
autoheader: Use AC_DEFINE([SYSCONF_DIR], [], [Description])

Add missing AM_PROG_CC_C_O

Makefile.am:21: compiling `vgrabbj.c' with per-target flags requires
`AM_PROG_CC_C_O' in `configure.in'

Remove extra spaces

Fix compiler warnings

ccvt_c.c: In function ‘ccvt_420i_yuyv’:
ccvt_c.c:471:11: warning: pointer of type ‘void *’ used in arithmetic [-Wpointer-arith]
ccvt_c.c: In function ‘ccvt_420i_uyvy’:
ccvt_c.c:510:11: warning: pointer of type ‘void *’ used in arithmetic [-Wpointer-arith]

Fix compiler warnings

ccvt_c.c: In function ‘ccvt_yuyv’:
ccvt_c.c:256:17: warning: variable ‘linewidth’ set but not used [-Wunused-but-set-variable]
ccvt_c.c: In function ‘ccvt_uyvy’:
ccvt_c.c:353:17: warning: variable ‘linewidth’ set but not used [-Wunused-but-set-variable]