Add --with-openssl info to BUILD.md

Clarify that --with-openssl must be passed a path, e.g.,
--with-openssl=/usr/lib64.

Signed-off-by: Stefan Gloor <[email protected]>

BUILD.md

@@ -13,7 +13,7 @@ This package requires the following:
 
 The usual command to build are:
 - autoreconf -fi (if needed)
-- ./configure (--with-openssl if needed)
+- ./configure (--with-openssl=/path/to/openssl if needed)
 - make
 - make check