dnl <var> ... basedir of kernel-headers (without the '/linux');
dnl this value will be AC_SUBST'ed
-AC_DEFUN(_ENSC_KERNEL_DIR,
+AC_DEFUN([_ENSC_KERNEL_DIR],
[
AC_CACHE_CHECK([for linux kernel dir], [ensc_cv_path_kerneldir],
[
}
])
-AC_DEFUN(ENSC_KERNEL_HEADERS,
+AC_DEFUN([ENSC_KERNEL_HEADERS],
[
AC_REQUIRE([_ENSC_KERNEL_DIR])
ensc_cv_path_kernelheaders=$ensc_cv_path_kerneldir/include
])
- $1=$ensc_cv_path_kernelheaders
- AC_SUBST($1)
+ if test x"$1" != x; then
+ $1=$ensc_cv_path_kernelheaders
+ AC_SUBST($1)
+ fi
])