GMP can be used as a fall-back if you have problems with the MPI library
included within this package.
-'--with-libidn[=DIR]'
-
- The SILC requires GNU Libidn for the stringprep() function. If your
-system does not have it installed by default you will need to install it
-and possibly give this option to specify its location. The DIR is the
-upper path in your system which contains lib/ and include/ for libidn
-(e.g. /usr/local).
-
-'--with-iconv[=DIR]'
+`--with-iconv[=DIR]'
If your system doesn't provide iconv() function in its native libraries
(usually libc) or if this function is broken (e.g. older Solaris systems),