Hoping I am not duplicating a post here but in the current git repository (https://github.com/transcoder/CasinoCoin), the file ../src/leveldb/build_detect_platform should have execute permissions.

$ make -f makefile.unix
Building LevelDB ...
/bin/sh: 1: ./build_detect_platform: Permission denied
make[1]: Entering directory `/home/kimlan/Downloads/casinocoin-qt/src/leveldb'
Makefile:18: build_config.mk: No such file or directory
make[1]: *** No rule to make target `build_config.mk'. Stop.
make[1]: Leaving directory `/home/kimlan/Downloads/casinocoin-qt/src/leveldb'
make: *** [leveldb/libleveldb.a] Error 2

PLEASE IGNORE THIS: I just seen https://bitcointalk.org/index.php?topic=463718 instead