Add nettle to build documentation

diff --git a/BUILDING.txt b/BUILDING.txt
index e20bb3d3310215bfa8e39391baed7aa19073735f..0d31a8f0d58ea0b55c875fe8a77ed28fc9aa4c06 100644 (file)
--- a/BUILDING.txt
+++ b/BUILDING.txt
@@ -19,6 +19,9 @@ Build Requirements (All Systems)
    * GnuTLS 3.x
    * See "Building TLS Support" below.
 
+-- If building RSA-AES support:
+   * Nettle 3.0 or later
+
 -- If building native language support (NLS):
    * Gnu gettext 0.14.4 or later
    * See "Building Native Language Support" below.