Hi Matt, Thanks for your reply.
Yes, at the current stage maybe my question is rather concerning GNU auto tools. I have also read the sections you pointed out in the Guile manual. GNU Chess has not been using the garbage collector so far. I have added these lines in configure.ac: dnl AC_ARG_ENABLE(guile, dnl AC_HELP_STRING([--enable-guile],[Enable Guile support [[default=no]]]), dnl [case $enableval in dnl yes|no) ;; dnl ") AC_MSG_ERROR([bad value $enableval for --enable-guile, need yes or no]) ;; dnl esac], dnl [enable_guile=false]) AC_ARG_ENABLE(guile, [ --enable-guile Enable Guile support [default=false]], [case "${enableval}" in yes | y) guile=true ;; no | n) guile=false ;; *) AC_MSG_ERROR(bad value ${enableval} for --enable-guile) ;; esac],[guile=false]) AM_CONDITIONAL([HAVE_GUILE], [test x$guile = xtrue]) I have added these lines in src/Makefile.am: if HAVE_GUILE gnuchess_SOURCES += guile.cc AM_CPPFLAGS += `guile-config compile` -DHAVE_GUILE AM_LDFLAGS += `guile-config link` endif This way I can configure the package with guile support: ./configure --enable-guile Whereas guile will not be used/required by default: ./configure And I can use C recompilation directives like this: #ifdef HAVE_GUILE do_some_guile_work(); #endif With do_some_guile_work() defined in guile.cc. So far so good, apparently. Is this the way to go? Regards, Antonio