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diff -ur mpg321-0.2.12-1.orig//configure.ac mpg321-0.2.12-1/configure.ac
--- mpg321-0.2.12-1.orig//configure.ac	2010-07-03 07:46:40.000000000 -0400
+++ mpg321-0.2.12-1/configure.ac	2011-08-20 19:50:32.143229893 -0400
@@ -75,6 +75,12 @@
 
 AC_CHECK_FUNCS([gethostbyname memset munmap socket strchr strdup strerror strrchr strstr gettimeofday select getenv putenv setenv unsetenv strcasecmp])
 
+dnl Check if math library is needed.
+AC_CHECK_FUNC(lround)
+if test "$ac_cv_func_lround" = no; then
+  AC_CHECK_LIB(m, lround)
+fi
+
 AC_ARG_ENABLE(mpg123_symlink,
 [  --enable-mpg123-symlink Enable symlink of mpg123 to mpg321 [[default=yes]] ],
 ,enable_mpg123_symlink=yes)