Can't build

[joehillen]

$ make
make[1]: Entering directory '/home/joe/src/cgrep/src'
ghc --make -hide-package bytestring-0.10.0.2 -O2 -Wall -threaded -rtsopts -with-rtsopts="-A64M -N" -cpp Main.hs -o ../bin/cgrep
<command line>: cannot satisfy -hide-package bytestring-0.10.0.2
    (use -v for more information)
Makefile:23: recipe for target 'cgrep' failed
make[1]: *** [cgrep] Error 1
make[1]: Target 'all' not remade because of errors.
make[1]: Leaving directory '/home/joe/src/cgrep/src'
Makefile:12: recipe for target 'src' failed
make: *** [src] Error 2
 2 
$ cabal install bytestring
Resolving dependencies...
All the requested packages are already installed:
bytestring-0.10.4.0
Use --reinstall if you want to reinstall anyway.

You should probably use cabal instead of make.

[awgn]

Yes, absolutely. It's something planned for the near future. In the meanwhile, try removing the -hide-package bytestring from ghc command line in the Makefile.
You can also try the binary packages available for Debian Jessie and Wheezy :-)