跳出了下面这些信息，那个缺少的pkg.m4怎么安装？

$ ./autogen.sh

I am going to run ./configure with no arguments - if you wish
to pass any to it, please specify them on the ./autogen.sh command line.
libtoolize: putting auxiliary files in `.'.
libtoolize: copying file `./ltmain.sh'
libtoolize: putting macros in AC_CONFIG_MACRO_DIR, `m4'.
libtoolize: copying file `m4/libtool.m4'
libtoolize: copying file `m4/ltoptions.m4'
libtoolize: copying file `m4/ltsugar.m4'
libtoolize: copying file `m4/ltversion.m4'
libtoolize: copying file `m4/lt~obsolete.m4'
configure.ac:13: installing `./config.guess'
configure.ac:13: installing `./config.sub'
configure.ac:58: installing `./install-sh'
configure.ac:58: installing `./missing'
doc/examples/Makefile.am: installing `./depcomp'

Couldn't find pkg.m4 from pkg-config. Install the appropriate package for
your distribution or set ACLOCAL_PATH to the directory containing pkg.m4.
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