okay, I did it and now bootstrap ended, though some warnings appeared :
libtoolize: putting auxiliary files in `.'.
libtoolize: copying file `./ltmain.sh'
libtoolize: Consider adding `AC_CONFIG_MACRO_DIR([m4])' to configure.in and
libtoolize: rerunning libtoolize, to keep the correct libtool macros in-tree.
libtoolize: Consider adding `-I m4' to ACLOCAL_AMFLAGS in Makefile.am.
I then typed ./configure. The last lines of the output were :
checking for GTK2... configure: error: Package requirements (gtk+-2.0 >= 2.0.0) were not met:
No package 'gtk+-2.0' found
Consider adjusting the PKG_CONFIG_PATH environment variable if you
installed software in a non-standard prefix.
Alternatively, you may set the environment variables GTK2_CFLAGS
and GTK2_LIBS to avoid the need to call pkg-config.
See the pkg-config man page for more details.
What now ?