AC_DEFUN([GUILE_COMPAT], [guile_compat_save_CFLAGS="$CFLAGS" guile_compat_save_LIBS="$LIBS" CFLAGS="$GUILE_CFLAGS" LIBS="$GUILE_LDFLAGS" AC_CHECK_FUNCS([scm_c_define_module scm_c_read_string scm_gc_protect_object scm_list_1 scm_c_register_extension scm_make_real scm_num2double scm_c_define_gsubr]) AC_MSG_CHECKING(for scm_t_bits) AC_CACHE_VAL(ac_cv_have_scm_t_bits, [AC_TRY_COMPILE([#include ], [scm_t_bits a;], ac_cv_have_scm_t_bits=yes, ac_cv_have_scm_t_bits=no)]) AC_MSG_RESULT($ac_cv_have_scm_t_bits) if test $ac_cv_have_scm_t_bits = yes; then AC_DEFINE(HAVE_SCM_T_BITS) fi LIBS="$guile_compat_save_LIBS" CFLAGS="$guile_compat_save_CFLAGS"])