https://github.com/cyrusimap/cyrus-imapd/pull/4235
https://bugs.gentoo.org/721466

From e23a32e0516803b99ae18f0c4d5d42b59a2af111 Mon Sep 17 00:00:00 2001
From: Sam James <sam@gentoo.org>
Date: Thu, 15 Sep 2022 00:55:20 +0100
Subject: [PATCH 1/2] Test for libm

Test for -lm to avoid hardcoding it.

Signed-off-by: Sam James <sam@gentoo.org>
--- a/Makefile.am
+++ b/Makefile.am
@@ -1729,7 +1729,7 @@ master_master_SOURCES = \
 	master/masterconf.c \
 	master/masterconf.h \
 	master/service.h
-master_master_LDADD = lib/libcyrus_min.la $(LIBS) $(GCOV_LIBS) -lm
+master_master_LDADD = lib/libcyrus_min.la $(LIBS) $(GCOV_LIBS) $(LIBM)
 
 
 netnews_remotepurge_SOURCES = \
--- a/configure.ac
+++ b/configure.ac
@@ -143,6 +143,7 @@ if test $ac_cv_sys_long_file_names = no; then
         AC_MSG_ERROR(The Cyrus IMAPD requires support for long file names)
 fi
 AC_C_INLINE
+LT_LIB_M
 
 gl_VISIBILITY
 AH_BOTTOM([#if HAVE_VISIBILITY