Actually, since those variables should already be defined, according to your earlier posts, all you should need to type is
perl Makefile.PL $CFLAGS $LDFLAGS
To make sure the variables are set correctly you can type
printenv | grep FLAGS
If they aren't set correctly, you can run the export command in an earlier posting to fix it.
Also, if you don't want to sit around and wait (although for troubleshooting purposes, it's probably better to do so), you can type
perl Makefile.PL $CFLAGS $LDFLAGS && make && make test && make install
The && means that the command will only execute if the previous one was OK.