AC_SUBST(KRB5_CFLAGS)
AC_SUBST(KRB5_LIBS)

if test x$KRB5_LIBS != x; then
    KRB5_PASSED_LIBS=$KRB5_LIBS
fi

if test x$KRB5_CFLAGS != x; then
    KRB5_PASSED_CFLAGS=$KRB5_CFLAGS
fi

AC_PATH_PROG(KRB5_CONFIG, krb5-config)
AC_MSG_CHECKING(for working krb5-config)
if test -x "$KRB5_CONFIG"; then
  KRB5_CFLAGS="`$KRB5_CONFIG --cflags`"
  KRB5_LIBS="`$KRB5_CONFIG --libs`"
  AC_MSG_RESULT(yes)
else
    if test x$KRB5_PASSED_LIBS = x; then
        AC_MSG_ERROR(no. Please install MIT kerberos devel package)
    fi
fi

if test x$KRB5_PASSED_LIBS != x; then
    KRB5_LIBS=$KRB5_PASSED_LIBS
fi

if test x$KRB5_PASSED_CFLAGS != x; then
    KRB5_CFLAGS=$KRB5_PASSED_CFLAGS
fi

AC_ARG_VAR([KRB5_CFLAGS], [C compiler flags for kerberos, overriding krb5-config])dnl
AC_ARG_VAR([KRB5_LIBS], [linker flags for kerberos, overriding krb5-config])dnl

SAVE_CFLAGS=$CFLAGS
SAVE_LIBS=$LIBS
CFLAGS="$CFLAGS $KRB5_CFLAGS"
LIBS="$LIBS $KRB5_LIBS"
AC_CHECK_HEADERS([krb5.h krb5/krb5.h])
AC_CHECK_FUNCS([krb5_get_init_creds_opt_alloc krb5_get_error_message \
                krb5_free_unparsed_name \
                krb5_get_init_creds_opt_set_expire_callback \
                krb5_get_init_creds_opt_set_fast_ccache_name \
                krb5_get_init_creds_opt_set_fast_flags \
                krb5_get_init_creds_opt_set_canonicalize \
                krb5_unparse_name_flags])
CFLAGS=$SAVE_CFLAGS
LIBS=$SAVE_LIBS

if test x$ac_cv_header_krb5_h != xyes -a x$ac_cv_header_krb5_krb5_h != xyes
then
  AC_MSG_ERROR(you must have Kerberos 5 header files to build gssproxy)
fi