as an extension, have putenv("VAR") behave as unsetenv("VAR")
-rw-r--r-- 106 .gitignore
-rw-r--r-- 4196 COPYRIGHT
-rw-r--r-- 5688 INSTALL
-rw-r--r-- 3586 Makefile
-rw-r--r-- 2510 README
-rw-r--r-- 25088 WHATSNEW
drwxr-xr-x - arch
-rwxr-xr-x 9272 configure
drwxr-xr-x - crt
drwxr-xr-x - dist
drwxr-xr-x - include
drwxr-xr-x - lib
drwxr-xr-x - src
drwxr-xr-x - tools