see https://bugs.gentoo.org/944997
use getopt from glibc/musl instead, getopt.h must be removed too
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1,10 +1,10 @@
 
 bin_PROGRAMS = a52dec extract_a52
-a52dec_SOURCES = a52dec.c getopt.c gettimeofday.c
+a52dec_SOURCES = a52dec.c gettimeofday.c
 a52dec_LDADD = $(top_builddir)/liba52/liba52.la \
 	       $(top_builddir)/libao/libao.a @LIBAO_LIBS@
-extract_a52_SOURCES = extract_a52.c getopt.c
+extract_a52_SOURCES = extract_a52.c
 
 man_MANS = a52dec.1 extract_a52.1
 
-EXTRA_DIST = configure.incl getopt.h gettimeofday.h $(man_MANS)
+EXTRA_DIST = configure.incl gettimeofday.h $(man_MANS)