Nuke gen/ before generating system files so that we don't keep dead files
tree32b3469003780d30e2572e70126981aec041fb6a
-rw-r--r-- 1240 .gitignore
drwxr-xr-x - CMake
-rw-r--r-- 1001 CMakeLists.txt
-rw-r--r-- 3218 LICENSE.PHP
-rw-r--r-- 2815 LICENSE.ZEND
-rw-r--r-- 2459 README.md
drwxr-xr-x - bin
-rwxr-xr-x 240 configure
drwxr-xr-x - hphp