Re: [libvirt] [PATCH] build: fix configure detection of if_bridge.h on RHEL 6

A fresh checkout on a RHEL 6 machine with these packages: kernel-headers-2.6.32-405.el6.x86_64 glibc-2.12-1.128.el6.x86_64 failed to configure with this message: checking for linux/if_bridge.h... no configure: error: You must install kernel-headers in order to compile libvirt with QEMU or LXC support Digging in config.log, we see that the problem is identical to what we fixed earlier in commit d12c2811: configure:98831: checking for linux/if_bridge.h configure:98853: gcc -std=gnu99 -c -g -O2 conftest.c >&5 In file included from /usr/include/linux/if_bridge.h:17, from conftest.c:559: /usr/include/linux/in6.h:31: error: redefinition of 'struct in6_addr' /usr/include/linux/in6.h:48: error: redefinition of 'struct sockaddr_in6' /usr/include/linux/in6.h:56: error: redefinition of 'struct ipv6_mreq' configure:98860: $? = 1 I had not hit it earlier because I was using incremental builds, where config.cache had shielded me from the kernel-headers breakage. * configure.ac (if_bridge.h): Avoid conflicting type definitions. Signed-off-by: Eric Blake <eblake(a)redhat.com&gt; --- Pushing under the build-breaker rule, and backporting to v1.1.1-maint