export PATH_SEPARATOR=;
The semi-colon should be quoted:
export PATH_SEPARATOR=';'
This tripped me while building latest snapshots of GDB.
I don't know how did we fail to see this earlier; perhaps the latest
Autotools define PACKAGE_VERSION, while older did not, or perhaps they
define it earlier, before config.site is loaded.
If you are using Bash 2.05, the config.site file that came with it
doesn't have this problem.