@@ -32,11 +32,13 @@
 	have_sel_getName="yes"
 	AC_DEFINE(HAVE_SEL_GETNAME, 1, [Whether we have sel_getName])])
 test x"$have_sel_get_name" != x"yes" -a x"$have_sel_getName" != x"yes" && \
 	AC_ERROR(You need either sel_get_name or sel_getName in libobjc!)
 
-AC_CHECK_FUNC(asprintf, AC_DEFINE(HAVE_ASPRINTF, 1, "Whether we have asprintf"))
+AC_CHECK_FUNC(asprintf, [
+	AC_DEFINE(HAVE_ASPRINTF, 1, "Whether we have asprintf")
+	AC_SUBST(ASPRINTF, "asprintf.c")])
 
 AC_MSG_CHECKING(whether we have IPv6 support)
 AC_TRY_RUN([
 	#include <stdlib.h>
 	#include <string.h>