We will run cmake ourselves with our flags
Index: cmake-3.20.3/bootstrap
===================================================================
--- cmake-3.20.3.orig/bootstrap
+++ cmake-3.20.3/bootstrap
@@ -1968,6 +1968,7 @@ export CFLAGS
 export CXXFLAGS
 export LDFLAGS
 
+exit 0
 # Run bootstrap CMake to configure real CMake
 cmake_options="-DCMAKE_BOOTSTRAP=1"
 if test -n "${cmake_verbose}"; then