m4_default([$3], [HAVE_$1=yes])],
[m4_default([$4], [HAVE_$1=no])])])
-PKG_CHECK_MODULES([BDW_GC], [bdw-gc])
-AC_SUBST(BDW_GC_CFLAGS)
-AC_SUBST(BDW_GC_LIBS)
-CFLAGS="$CFLAGS $BDW_GC_CFLAGS"
-LIBS="$BDW_GC_LIBS $LIBS"
+PKG_CHECK_MODULES([GUILE], [guile-2.2], [],
+ [PKG_CHECK_MODULES([GUILE], [guile-2.0])])
+AC_SUBST(GUILE_CFLAGS)
+AC_SUBST(GUILE_LIBS)
HAVE_SOUND=no