Linux的automake出现的问题（Makefile.am: C objects in subdir but `AM_PROG_CC_C_O' not in `configure.ac'）

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工作中需要使用Linux上的automake编译项目代码，在生成Makefile文件的过程中，出现了如下的错误：

autoreconf: Entering directory `.'
autoreconf: configure.ac: not using Gettext
autoreconf: running: aclocal --force -I m4
autoreconf: configure.ac: tracing
autoreconf: running: libtoolize --copy --force
libtoolize: putting auxiliary files in `.'.
libtoolize: copying file `./ltmain.sh'
libtoolize: putting macros in AC_CONFIG_MACRO_DIR, `m4'.
libtoolize: copying file `m4

btool.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'
autoreconf: running: /usr/local/bin/autoconf --force
autoreconf: running: /usr/local/bin/autoheader --force
autoreconf: running: automake --add-missing --copy --force-missing
Makefile.am: C objects in subdir but `AM_PROG_CC_C_O' not in `configure.ac'
autoreconf: automake failed with exit status: 1

解决方法：

以后大家遇到这个问题只需要将目录下的所有configure.ac 包括子目录的都在最后一行加上AM_PROG_CC_C_O 就能解决了

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