It is usually safer to use the -o option in curl to specifiy your own temp file name in scripts because if the file changes in the url then your local file will also change and it will result in an error since you have that name hard coded in the next few lines (tar, rm)

bin/compile

@@ -68,9 +68,9 @@ then
     if [ -d "vendor/lib/sasl2" ]; then
       export LIBMEMCACHED=$(pwd)/vendor
     else
-      curl -s -L -O $VENDORED_MEMCACHED
-      tar -zxvf vendor-libmemcached.tar.gz > /dev/null
-      rm vendor-libmemcached.tar.gz
+      curl -s -L -o tmp-libmemcached.tar.gz $VENDORED_MEMCACHED
+      tar -zxvf tmp-libmemcached.tar.gz > /dev/null
+      rm tmp-libmemcached.tar.gz
       export LIBMEMCACHED=$(pwd)/vendor
     fi