I’m attempting to compile a native GCC compiler that uses a newly downloaded set of Linux headers and a newly compiled glibc. These two packages are installed in different directories. I’d like to specify --with-native-system-header-dir twice, once for each set of headers. I didn’t in fact try that, but I’m guessing that it’s not supported. I tried using --with-headers, but it’s supported only for cross compiles. Is there a set of configuration parameters that I can use to accomplish this? My configure line is: ../configure --with-sysroot=/home/sjackman/.linuxbrew --prefix=/Cellar/xgcc/4.9.1 --with-native-system-header-dir=/opt/glibc/include The glibc headers are installed in $sysroot/opt/glibc/include. The linux headers are installed in $sysroot/opt/linux-headers/include and also symlinked into $sysroot/include. Thanks, Shaun http://sjackman.ca