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='2020-01-14 18:31:35 +0100'>2020-01-14</span></td><td><a href='/guix/commit/gnu/packages/file.scm?id=488c30437ca12ea6bf487180c1d28df381413e98'>gnu: file: Update to 5.38.</a><span class='msg-avail'>...</span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2019-10-28 12:47:59 -0400'>2019-10-28</span></td><td><a href='/guix/commit/gnu/packages/file.scm?id=1051facc8108110e582f2c0a9d8a5fd38b1486b6'>gnu: file: Update to 5.37 [fixes CVE-2019-18218].</a><span class='msg-avail'>...</span></td><td>Leo Famulari</td></tr>
<tr><td><span title='2019-05-01 23:11:41 +0200'>2019-05-01</span></td><td><a href='/guix/commit/gnu/packages/file.scm?id=3b458d5462e6bbd852c2dc5c6670d5655abf53f5'>Merge branch 'master' into core-updates</a></td><td>Marius Bakke</td></tr>
<tr><td><span title='2019-03-30 15:19:32 +0100'>2019-03-30</span></td><td><a href='/guix/commit/gnu/packages/file.scm?id=528ea990c3a815cb4b0ded913ea22cdc778839bd'>gnu: Use 'this-package' as a native input instead of 'self-native-input?'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-02-07 22:10:16 +0100'>2019-02-07</span></td><td><a href='/guix/commit/gnu/packages/file.scm?id=cc43d807c08af02d31770a011881990d46428737'>gnu: file: Incorporate grafted changes.</a><span class='msg-avail'>...</span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2018-12-24 11:12:52 +0200'>2018-12-24</span></td><td><a href='/guix/commit/gnu/packages/file.scm?id=e47c69f22638dc92ee962942b8e24284c8dee832'>gnu: file: Fix CVE-2018-10360.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2018-05-01 03:35:06 +0200'>2018-05-01</span></td><td><a href='/guix/commit/gnu/packages/file.scm?id=32c18fcb3c3cb10303aa4ef07571867e8ce3fe8d'>gnu: file: Update to 5.33.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>