diff -up krita-5.2.2/cmake/modules/FindFFTW3.cmake.orig krita-5.2.2/cmake/modules/FindFFTW3.cmake
--- krita-5.2.2/cmake/modules/FindFFTW3.cmake.orig	2023-12-06 12:38:26.000000000 +0100
+++ krita-5.2.2/cmake/modules/FindFFTW3.cmake	2024-01-07 16:43:38.890922702 +0100
@@ -66,6 +66,8 @@ This will define the following variables
 
 #]=======================================================================]
 
+# Workaround for missing FFTW3LibraryDepends.cmake in fftw3
+if(NotUsingCmake)
 include(FindPackageHandleStandardArgs)
 
 set(PKG_FFTW_CONFIG_DIR CACHE STRING "PkgConfig path for locating the package modules")
@@ -171,6 +173,7 @@ if(FFTW3_FOUND)
     # )
     # return()
 endif()
+endif()
 
 find_package(PkgConfig QUIET)