Copied from Debian.

Description: Explicitely link against -lm
Bug-Debian: http://bugs.debian.org/553595
Author: Fabian Greffrath <fabian@debian-unofficial.org>, Dmitrijs Ledkovs <dmitrij.ledkov@gmail.com>

---
 libao/Makefile.am |    1 +
 src/Makefile.am   |    2 +-
 2 files changed, 2 insertions(+), 1 deletions(-)

--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1,9 +1,9 @@
-CFLAGS = @A52DEC_CFLAGS@
+AM_CFLAGS = @A52DEC_CFLAGS@
 
 bin_PROGRAMS = a52dec extract_a52
 a52dec_SOURCES = a52dec.c getopt.c gettimeofday.c
 a52dec_LDADD = $(top_builddir)/liba52/liba52.la \
-	       $(top_builddir)/libao/libao.a @LIBAO_LIBS@
+	       $(top_builddir)/libao/libao.a @LIBAO_LIBS@ -lm
 extract_a52_SOURCES = extract_a52.c getopt.c
 
 man_MANS = a52dec.1 extract_a52.1
--- a/liba52/Makefile.am
+++ b/liba52/Makefile.am
@@ -1,4 +1,4 @@
-CFLAGS = @CFLAGS@ @LIBA52_CFLAGS@
+AM_CFLAGS = @CFLAGS@ @LIBA52_CFLAGS@
 
 lib_LTLIBRARIES = liba52.la
 
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<tr><td><span title='2020-12-14 12:15:06 -0500'>2020-12-14</span></td><td><a href='/guix/commit/etc/git/pre-push?id=80ebcdd100a82fdc582e62f35042c74ce38ea753'>maint: Only run `make authenticate` when pushing commits.</a><span class='msg-avail'>...<span class='msg-tooltip'>* etc/git/pre-push: Exit early when deleting a branch.
</span></span></td><td>Leo Famulari</td></tr>
<tr><td><span title='2020-06-01 00:51:38 +0200'>2020-06-01</span></td><td><a href='/guix/commit/etc/git/pre-push?id=6f6758c45d3913dbf98bb8e50f21f7bfb25b40ea'>maint: Adjust comment in 'pre-push' hook.</a><span class='msg-avail'>...<span class='msg-tooltip'>* etc/git/pre-push: Adjust comment.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-05-29 18:31:38 +0200'>2020-05-29</span></td><td><a href='/guix/commit/etc/git/pre-push?id=e65a44649e8d7698c4a888f1de625a67052520e9'>maint: Git pre-push hook runs "make authenticate check-channel-news".</a><span class='msg-avail'>...<span class='msg-tooltip'>* etc/git/pre-push: Change to run "make authenticate check-channel-news".
</span></span></td><td>Ludovic Courtès</td></tr>