THE SOFTWARE.
-The MIT software license (http://www.opensource.org/licenses/mit-license.php)
-above applies to the code directly included in this source distribution.
-Dependencies downloaded as part of the build process may be covered by other
-open-source licenses. For further details see 'contrib/debian/copyright'.
+The MIT software license (https://www.opensource.org/licenses/mit-license.php)
+above applies to the code directly included in this source distribution, with
+the exception of certain Autoconf macros. Dependencies downloaded as part of
+the build process may be covered by other open-source licenses. The MIT-licensed
+source code is not considered a derived work of these Autoconf macros or of the
+dependencies. For further details see 'contrib/debian/copyright'.
This product includes software developed by the OpenSSL Project for use in the
licenses, users and distributors should note that when built using the default
build options, Zcash depends on Oracle Berkeley DB 6.2.x, which is licensed
under the GNU Affero General Public License.
+
+
+Contributors should understand licensing implications before modifying the
+following files in build-aux/m4 (see https://github.com/zcash/zcash/issues/2827):
+
+ * ax_check_compile_flag.m4
+ * ax_check_link_flag.m4
+ * ax_check_preproc_flag.m4
+ * ax_compiler_vendor.m4
+ * ax_gcc_archflag.m4
+ * ax_gcc_x86_cpuid.m4
+ * ax_openmp.m4
+ * ax_pthread.m4