Then I enter in src directory the command : make -f makefile.unix
also this command: make -f makefile.unix clean; make -f makefile.unix USE_UPNP= bitcoind
only brings up the following errors:
make: makefile.unix: No such file or directory
Before using the -f argument with make, you might want to first check what the name of the makefile actually is. If you did (and configure completed successfully), you would see that Bitcoin's makefile is named Makefile, and the -f argument is thus not required. To compile Bitcoin, simply run make with no arguments.