使用rpmbuild --rebuild构建qmail RPM失败，求解决方案及替代邮件系统

First off, let's walk through the most common fixes for rpmbuild --rebuild failures with this specific qmail source RPM, since you've already worked through initial dependency and environment issues:

• Install all required development tools
  The qmail 1.03-112patch_14_15 build relies on a full set of build utilities that might not be present by default. Run this command to install them:

  # For RHEL/CentOS 7 and below
  yum install gcc make patch autoconf automake rpm-build libssl-devel -y
  # For RHEL/CentOS 8+
  dnf install gcc make patch autoconf automake rpm-build openssl-devel -y
  

• Fix build directory permissions
  Sometimes the source RPM extracts files with restrictive permissions that break the build. Reset permissions in your RPM workspace:

  chmod -R 755 ~/rpmbuild/SOURCES/qmail-*
  

• Verify patch application
  The build relies on patches 14 and 15 being applied correctly. If the log shows patch failures, apply them manually before rebuilding:

  cd ~/rpmbuild/SOURCES/qmail-1.03
  patch -p1 < qmail-1.03.patch14
  patch -p1 < qmail-1.03.patch15
  cd ../..
  rpmbuild --rebuild qmail-1.03-112patch_14_15.src.rpm
  

• Resolve conflicting mail packages
  Existing mail servers like sendmail or postfix can conflict with qmail's build process. Temporarily remove them:

  systemctl stop sendmail postfix
  yum remove sendmail postfix -y
  

If you share the exact final error output from your build log, we can pinpoint the issue even more precisely—common late-stage failures include SELinux policy blocks or missing library headers for TLS support.

内容的提问来源于stack exchange，提问作者Alan Wong