Getting Gambit to respect prefix settings at configure

After posting a concern about Gambit inserting an additional "version" directory into the installation path, the following was suggested on the Gambit mailing list and works perfectly. When executing make install set the PACKAGE_SUBDIR="" to remove the version number from the installation path.

For me the configure, make, install routine works as follows:

$ ./configure --enable-single-host --enable-gcc-opts --prefix=/Users/Shared
$ make install prefix=/usr/local PACKAGE_SUBDIR=""

This places the Gambit files in the directories I expect them to be in.