Use gcc "unused" attribute only with gcc >= 3.5.
-rw-r--r-- 1265 .gitignore
-rw-r--r-- 5546 AUTHORS
-rw-r--r-- 17992 COPYING
-rw-r--r-- 26536 COPYING.LIB
-rw-r--r-- 492 ChangeLog
-rw-r--r-- 41644 ChangeLog-2011
-rw-r--r-- 9416 INSTALL
-rw-r--r-- 2836 Makefile.am
-rw-r--r-- 26184 NEWS
-rw-r--r-- 11130 README
-rw-r--r-- 2267 README.GIT
-rw-r--r-- 6924 THANKS
-rw-r--r-- 2076 TODO
-rw-r--r-- 12279 acinclude.m4
-rwxr-xr-x 7871 autogen.sh
drwxr-xr-x - cipher
drwxr-xr-x - compat
-rwxr-xr-x 3707 compile
-rwxr-xr-x 44875 config.guess
-rwxr-xr-x 18343 config.rpath
-rwxr-xr-x 35621 config.sub
-rw-r--r-- 59443 configure.ac
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drwxr-xr-x - doc
-rwxr-xr-x 13663 install-sh
-rw-r--r-- 2604 libgcrypt.txt
-rw-r--r-- 283829 ltmain.sh
drwxr-xr-x - m4
-rwxr-xr-x 11014 missing
-rwxr-xr-x 3495 mkinstalldirs
drwxr-xr-x - mpi
drwxr-xr-x - random
drwxr-xr-x - scripts
drwxr-xr-x - src
-rw-r--r-- 10 stamp-h.in
drwxr-xr-x - tests