masatana commented on pull request #644:
URL: https://github.com/apache/bigtop/pull/644#issuecomment-638730075


   [According to the 
document](https://rpm-packaging-guide.github.io/#rpm-macros), we can test RPM 
macros by using `rpm --eval`.
   
   On CentOS8:
   
   ```
   [root@2678a9e39734 /]# cat /etc/os-release
   NAME="CentOS Linux"
   VERSION="8 (Core)"
   ID="centos"
   ID_LIKE="rhel fedora"
   VERSION_ID="8"
   PLATFORM_ID="platform:el8"
   PRETTY_NAME="CentOS Linux 8 (Core)"
   ANSI_COLOR="0;31"
   CPE_NAME="cpe:/o:centos:centos:8"
   HOME_URL="https://www.centos.org/";
   BUG_REPORT_URL="https://bugs.centos.org/";
   
   CENTOS_MANTISBT_PROJECT="CentOS-8"
   CENTOS_MANTISBT_PROJECT_VERSION="8"
   REDHAT_SUPPORT_PRODUCT="centos"
   REDHAT_SUPPORT_PRODUCT_VERSION="8"
   
   [root@2678a9e39734 /]# rpm --eval %{?rhel}
   8
   ```


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