This patch allows us to make the libgcrypt dependency optional (which it
is, if you look at the code), which in turns allows us to build CRDA
without the signature-checking capability on 'regulatory.bin'.

--- crda/Makefile	2015-07-17 11:33:33.546712893 +0200
+++ crda/Makefile	2015-07-17 11:34:05.210994373 +0200
@@ -45,12 +45,14 @@ LDLIBS += `pkg-config --libs openssl`
 $(LIBREG): keys-ssl.c
 
 else
+ifeq ($(USE_GCRYPT),1)
 CFLAGS += -DUSE_GCRYPT
 LDLIBS += -lgcrypt
 
 $(LIBREG): keys-gcrypt.c
 
 endif
+endif
 MKDIR ?= mkdir -p
 INSTALL ?= install
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<tr><td><span title='2019-08-01 05:43:33 +0200'>2019-08-01</span></td><td><a href='/guix/commit/gnu/packages/scanner.scm?id=a094693de3b5c6a97ef8b4bb280d49f0f1ba5e56'>gnu: sane-backends: Build back ends that need JPEG support.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2019-08-01 05:34:56 +0200'>2019-08-01</span></td><td><a href='/guix/commit/gnu/packages/scanner.scm?id=7018f926d4efcab681cca99e2da43b179d4af396'>gnu: sane-backends-minimal: Update to 1.0.28.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2019-03-18 15:05:09 +0100'>2019-03-18</span></td><td><a href='/guix/commit/gnu/packages/scanner.scm?id=21b9c6fade382a11a058d7632a7f4a1094766631'>Order (gnu packages scanner) module imports alphabetically.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2019-03-10 17:12:16 +0100'>2019-03-10</span></td><td><a href='/guix/commit/gnu/packages/scanner.scm?id=6845ab5204b1b6b89282ea315d32a2f007578116'>gnu: Import (gnu packages image) in (gnu packages scanner).</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2019-03-10 16:33:55 +0100'>2019-03-10</span></td><td><a href='/guix/commit/gnu/packages/scanner.scm?id=10bd2889d267df479f79f43471d3c2dd17da345a'>gnu: sane-backends: Support PNG scanimage output.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2019-03-07 02:13:26 +0100'>2019-03-07</span></td><td><a href='/guix/commit/gnu/packages/scanner.scm?id=abe6e670d356b8333b41c7359c0ab25a58fe736b'>gnu: sane-backends-minimal: Fix USB support.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2018-07-25 11:52:59 +0300'>2018-07-25</span></td><td><a href='/guix/commit/gnu/packages/scanner.scm?id=8e1895964fd10fbf5f19ad39ca080f684a6246d6'>gnu: Add hplip-minimal.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2018-04-12 04:02:40 -0400'>2018-04-12</span></td><td><a href='/guix/commit/gnu/packages/scanner.scm?id=372947725a4fcbcf65a1e7d403ac123895d337da'>gnu: sane-backends-minimal: Return #t from all phases.</a><span class='msg-avail'>...</span></td><td>Mark H Weaver</td></tr>
<tr><td><span title='2018-03-16 09:08:31 -0400'>2018-03-16</span></td><td><a href='/guix/commit/gnu/packages/scanner.scm?id=6cbee49d6668eb7fd738080666f66febfce8c7e8'>gnu: All snippets report errors using exceptions, else return #t.</a><span class='msg-avail'>...</span></td><td>Mark H Weaver</td></tr>
<tr><td><span title='2017-05-24 22:54:39 +0200'>2017-05-24</span></td><td><a href='/guix/commit/gnu/packages/scanner.scm?id=4ed390a0e7fc468303c07d6efebc54c80b2369c5'>gnu: sane-backends-minimal: Run most tests.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2017-05-24 22:54:39 +0200'>2017-05-24</span></td><td><a href='/guix/commit/gnu/packages/scanner.scm?id=4febd4b0f4fc99eb9357180166764febc410812e'>gnu: sane-backends-minimal, sane-backends: Update to 1.0.27.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>