report errors

[root@localhost opt]# ls
apr-1.6.2.tar.gz
apr-util-1.6.0.tar.gz
boost_1_59_0.tar.gz
httpd-2.4.29.tar.bz2
mysql-boost-5.7.20.tar.gz
rh
[root@localhost opt]# yum install -y \
> gcc \
> gcc -c++ \
> ncurses-devel \
> bison \
> cmake
CRITICAL:yum.cli:Config error: Error accessing file for config file:///opt/++
error:
[root@localhost opt]# yum -y install gcc gcc-c++ make pcre pcre-devel expat-devel perl
Enter this command to solve the installation problem!!!

solve!