From 2e1ac7f5d5045286cbcce8e1787e1e98281e4b9f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Stefan=20Br=C3=BCns?= <stefan.bruens@rwth-aachen.de>
Date: Sat, 20 Nov 2021 19:28:57 +0100
Subject: [PATCH] Add missing libm link library to kissfft module

Fixes #18390.
---
 ThirdParty/kissfft/vtkkissfft/CMakeLists.txt | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/ThirdParty/kissfft/vtkkissfft/CMakeLists.txt b/ThirdParty/kissfft/vtkkissfft/CMakeLists.txt
index 6cb26cd44f..3e583cffc7 100644
--- a/ThirdParty/kissfft/vtkkissfft/CMakeLists.txt
+++ b/ThirdParty/kissfft/vtkkissfft/CMakeLists.txt
@@ -40,3 +40,7 @@ endif ()
 target_include_directories(kissfft
   PRIVATE
     "$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>")
+
+if(UNIX)
+	vtk_module_link(VTK::kissfft PRIVATE m)
+endif()
-- 
2.33.1