Installer les *.gz.tar

je ne comprends pas les instructions à faire :

./configure
./make
./make install

pas d'arguments ? dans quel répertoire se placer ?
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ce que j'ai fait :

truck@muche :~/Documents/drivers/gspcav1-20071224$ sudo ./gspca_build
REMOVE the old module if present
CLEAN gspca source tree
rm -r -f *.o decoder/.gspcadecoder.o.cmd decoder/*.o \
gspca.o.cmd *.o *.ko *.mod.* .[a-z]* core *.i \
*.symvers *.err
COMPILE gspca Please Wait ....!!
INSTALL gspca in the kernel binary tree
mkdir -p /lib/modules/`uname -r`/kernel/drivers/usb/media/
rm -f /lib/modules/`uname -r`/kernel/drivers/usb/media/spca5xx.ko
rm -f /lib/modules/`uname -r`/kernel/drivers/media/video/gspca.ko
install -c -m 0644 gspca.ko /lib/modules/`uname -r`/kernel/drivers/usb/media/
/sbin/depmod -ae
LOAD gspca in memory

PRINT COMPILATION MESSAGES if ERRORS look kgspca.err
make -C /lib/modules/`uname -r`/build SUBDIRS=/home/papik/Documents/drivers/gspcav1-20071224 CC=cc modules
make[1]: entrant dans le répertoire « /usr/src/linux-headers-2.6.22-14-generic »
CC [M] /home/papik/Documents/drivers/gspcav1-20071224/gspca_core.o
CC [M] /home/papik/Documents/drivers/gspcav1-20071224/decoder/gspcadecoder.o
LD [M] /home/papik/Documents/drivers/gspcav1-20071224/gspca.o
Building modules, stage 2.
MODPOST 1 modules
CC /home/truc/Documents/drivers/gspcav1-20071224/gspca.mod.o
LD [M] /home/truc/Documents/drivers/gspcav1-20071224/gspca.ko
make[1]: quittant le répertoire « /usr/src/linux-headers-2.6.22-14-generic »

truc@muche:~/Documents/drivers/gspcav1-20071224$
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et ensuite que dois-je faire ?

ce que dit le readme :
as root
goes to gspcav1 directory and run:
./gspca_build

if all goes right the module is compiled and load in memory
if not, errors messages can be found in kgspca.err You should post this file to the maintainer
or in the sourceforge project bugs report. <http://sourceforge.net/projects/spca50x/>.
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ça je l'ai fait (voir ci-dessus)
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Trying a v4l app
================
goes to gspcagui directory
be sure to have libsdl installed with the header
then
make
as root
make install
Plug your webcam and run
gspcagui -d /dev/video0
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il n'y a pas de gspcagui directory ???