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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 <libguile.h>],
[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"])
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