From b46d474f2a81e11a3e97cb9685c676e29967b32f Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pj@pehjota.net>
Date: Sat, 27 Mar 2021 16:52:29 -0400
Subject: build: Check for atan2()

---
diff --git a/configure.ac b/configure.ac
index 9928b50..1c86c10 100644
--- a/configure.ac
+++ b/configure.ac
@@ -47,6 +47,9 @@ AC_CHECK_FUNCS(
 if ${funcs_missing}; then
 	AC_MSG_ERROR([required functions are missing])
 fi
+AC_SEARCH_LIBS([atan2], [m], [], [
+	AC_MSG_ERROR([required functions are missing])
+])
 AC_SEARCH_LIBS([cos], [m], [], [
 	AC_MSG_ERROR([required functions are missing])
 ])
--
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