运行autogen.sh需要：yum install autoconf automake libtool

[zlf@localhost protobuf-3.5.1_source]$ ./autogen.sh
+ autoreconf -f -i -Wall,no-obsolete
./autogen.sh: line 50: autoreconf: command not found

[root@localhost protobuf-3.5.1_source]# yum install autoconf

[root@localhost protobuf-3.5.1_source]# ./autogen.sh
+ autoreconf -f -i -Wall,no-obsolete
Can't exec "aclocal": No such file or directory at /usr/share/autoconf/Autom4te/FileUtils.pm line 326.
autoreconf: failed to run aclocal: No such file or directory

[root@localhost protobuf-3.5.1_source]# yum install automake

[root@localhost protobuf-3.5.1_source]# ./autogen.sh
+ autoreconf -f -i -Wall,no-obsolete
configure.ac:30: error: possibly undefined macro: AC_PROG_LIBTOOL
      If this token and others are legitimate, please use m4_pattern_allow.
      See the Autoconf documentation.
autoreconf: /usr/bin/autoconf failed with exit status: 1

[root@localhost protobuf-3.5.1_source]# yum install libtool

[root@localhost protobuf-3.5.1_source]# ./autogen.sh
+ rm -rf autom4te.cache config.h.in~
+ exit 0