Disable the cmake find_package method. It will instead fallback to use pkgconfig.
Without this, it will fail to find fftw3 and error out.

--- a/cmake/modules/FindFFTW3.cmake	2023-11-24 19:59:45.904059240 +0100
+++ b/cmake/modules/FindFFTW3.cmake	2023-11-24 20:00:17.029563107 +0100
@@ -74,9 +74,9 @@
 endforeach()
 mark_as_advanced(PKG_FFTW_CONFIG_DIR)
 
-find_package(FFTW3 QUIET NO_MODULE
-    HINTS ${PKG_FFTW_CONFIG_DIR} /usr/lib/cmake/fftw3 /usr/local/lib/cmake/fftw3
-)
+#find_package(FFTW3 QUIET NO_MODULE
+#    HINTS ${PKG_FFTW_CONFIG_DIR} /usr/lib/cmake/fftw3 /usr/local/lib/cmake/fftw3
+#)
 mark_as_advanced(FFTW3_DIR)
 
 # if we found the FFTW3 CMake package then we can start