diff --git a/CMakeLists.txt b/CMakeLists.txt
index b16d74ac71..2ecd672b73 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,41 +1,44 @@
 # Copyright (c) 2017 The Bitcoin developers
 
 cmake_minimum_required(VERSION 3.5)
 project(bitcoin-abc
 	VERSION 0.20.3.0
 	# TODO add description and homepage when CMake > 3.12 is enforced.
 	# DESCRIPTION "Bitcoin ABC is a full node implementation of the Bitcoin Cash protocol."
 	# HOMEPAGE "https://www.bitcoinabc.org"
 )
 
 # Add path for custom modules
 set(CMAKE_MODULE_PATH
 	${CMAKE_MODULE_PATH}
 	${CMAKE_CURRENT_SOURCE_DIR}/cmake/modules
 )
 
 # Make contrib script accessible.
 set(CONTRIB_PATH ${CMAKE_CURRENT_SOURCE_DIR}/contrib)
 
 # If ccache is available, then use it.
 find_program(CCACHE ccache)
 if(CCACHE)
 	set_property(GLOBAL PROPERTY RULE_LAUNCH_COMPILE ${CCACHE})
 	set_property(GLOBAL PROPERTY RULE_LAUNCH_LINK ${CCACHE})
 endif(CCACHE)
 
 # Default to RelWithDebInfo configuration
 if(NOT CMAKE_BUILD_TYPE)
 	set(CMAKE_BUILD_TYPE RelWithDebInfo CACHE STRING
 		"Select the configuration for the build" FORCE)
 endif()
 
+# Find the python interpreter. This is required for several targets.
+find_package(PythonInterp 3.4 REQUIRED)
+
 # Add the magic targets `check` and `check-all`
 add_custom_target(check-all)
 add_custom_target(check)
 
 add_subdirectory(src)
 add_subdirectory(test)
 
 add_subdirectory(contrib/devtools)
 add_subdirectory(doc)
diff --git a/contrib/devtools/CMakeLists.txt b/contrib/devtools/CMakeLists.txt
index c9cc63a29a..0dcd1f0311 100644
--- a/contrib/devtools/CMakeLists.txt
+++ b/contrib/devtools/CMakeLists.txt
@@ -1,23 +1,24 @@
 # Copyright (c) 2019 The Bitcoin developers
 
 add_custom_target(check-devtools)
 
-set(DEVTOOLS_TESTS
+set(DEVTOOLS_TESTS_PYTHON
   ./chainparams/test_make_chainparams.py
 )
 
-foreach(TEST ${DEVTOOLS_TESTS})
+foreach(TEST ${DEVTOOLS_TESTS_PYTHON})
   get_filename_component(TESTNAME ${TEST} NAME)
   get_filename_component(TESTPATH ${TEST} ABSOLUTE ${CMAKE_CURRENT_SOURCE_DIR})
   get_filename_component(WORKDIR ${TESTPATH} DIRECTORY)
   add_custom_target("check-devtools-${TESTNAME}"
     WORKING_DIRECTORY
       ${WORKDIR}
     COMMAND
+      "${PYTHON_EXECUTABLE}"
       "./${TESTNAME}"
   )
   add_dependencies(check-devtools "check-devtools-${TESTNAME}")
 endforeach()
 
 add_dependencies(check check-devtools)
 add_dependencies(check-all check-devtools)
diff --git a/src/bench/CMakeLists.txt b/src/bench/CMakeLists.txt
index 369ec14da1..4cac1af96a 100644
--- a/src/bench/CMakeLists.txt
+++ b/src/bench/CMakeLists.txt
@@ -1,71 +1,70 @@
 # Copyright (c) 2018 The Bitcoin developers
 
 project(bitcoin-bench)
 
 set(BENCH_DATA_RAW_FILES
 	data/block413567.raw
 )
 
 # Process raw files.
 file(MAKE_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/data")
 
-find_program(PYTHON python3)
 foreach(_raw_file ${BENCH_DATA_RAW_FILES})
 	string(APPEND
 		_generated_header_output
 		"${CMAKE_CURRENT_BINARY_DIR}/${_raw_file}" ".h"
 	)
 
 	list(APPEND BENCH_DATA_GENERATED_HEADERS ${_generated_header_output})
 	get_filename_component(_test_name ${_raw_file} NAME_WE)
 
 	add_custom_command(
 		OUTPUT "${_generated_header_output}"
-		COMMAND "${PYTHON}"
-		ARGS
+		COMMAND 
+			"${PYTHON_EXECUTABLE}"
 			"data/convert-raw-to-header.py"
 			"${_test_name}"
 			"${_raw_file}" > "${_generated_header_output}"
 		COMMENT "Transforming raw file ${_raw_file} into header"
 		MAIN_DEPEDENCY "${_raw_file}"
 		DEPENDS "data/convert-raw-to-header.py"
 		VERBATIM
 		WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
 	)
 endforeach()
 
 add_executable(bitcoin-bench
 	EXCLUDE_FROM_ALL
 	base58.cpp
 	bench.cpp
 	bench_bitcoin.cpp
 	cashaddr.cpp
 	ccoins_caching.cpp
 	checkblock.cpp
 	checkqueue.cpp
 	crypto_aes.cpp
 	crypto_hash.cpp
 	examples.cpp
 	gcs_filter.cpp
 	lockedpool.cpp
 	mempool_eviction.cpp
 	merkle_root.cpp
 	prevector.cpp
 	rollingbloom.cpp
 
 	# Add the generated headers to trigger the conversion command
 	${BENCH_DATA_GENERATED_HEADERS}
 )
 
 target_link_libraries(bitcoin-bench common bitcoinconsensus server)
 
 if(BUILD_BITCOIN_WALLET)
 	target_sources(bitcoin-bench PRIVATE coin_selection.cpp)
 endif()
 
 add_custom_target(bench-bitcoin
 	COMMAND
 		./bitcoin-bench
 	DEPENDS
 		bitcoin-bench
 )
diff --git a/src/test/CMakeLists.txt b/src/test/CMakeLists.txt
index 5703490d46..95de3f1bbb 100644
--- a/src/test/CMakeLists.txt
+++ b/src/test/CMakeLists.txt
@@ -1,181 +1,180 @@
 # Copyright (c) 2018 The Bitcoin developers
 
 project(bitcoin-test)
 
 # Process json files.
 file(MAKE_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/data")
 
-find_program(PYTHON python3)
 function(gen_json_header NAME)
 	set(HEADERS "")
 	foreach(f ${ARGN})
 		set(h "${CMAKE_CURRENT_BINARY_DIR}/${f}.h")
 
 		# Get the proper name for the test variable.
 		get_filename_component(TEST_NAME ${f} NAME_WE)
 		add_custom_command(OUTPUT ${h}
-			COMMAND ${PYTHON}
-			ARGS
+			COMMAND
+				"${PYTHON_EXECUTABLE}"
 				"${CMAKE_CURRENT_SOURCE_DIR}/data/generate_header.py"
 				"${TEST_NAME}"
 				"${CMAKE_CURRENT_SOURCE_DIR}/${f}" > ${h}
 			MAIN_DEPENDENCY ${f}
 			DEPENDS
 				"data/generate_header.py"
 			VERBATIM
 		)
 		list(APPEND HEADERS ${h})
 	endforeach(f)
 	set(${NAME} "${HEADERS}" PARENT_SCOPE)
 endfunction()
 
 gen_json_header(JSON_HEADERS
 	data/base58_encode_decode.json
 	data/blockfilters.json
 	data/key_io_valid.json
 	data/key_io_invalid.json
 	data/script_tests.json
 	data/sighash.json
 	data/tx_invalid.json
 	data/tx_valid.json
 )
 
 include(TestSuite)
 create_test_suite(bitcoin)
 add_dependencies(check check-bitcoin)
 
 add_test_to_suite(bitcoin test_bitcoin
 	activation_tests.cpp
 	addrman_tests.cpp
 	allocator_tests.cpp
 	amount_tests.cpp
 	arith_uint256_tests.cpp
 	avalanche_tests.cpp
 	base32_tests.cpp
 	base58_tests.cpp
 	base64_tests.cpp
 	bip32_tests.cpp
 	bitmanip_tests.cpp
 	blockchain_tests.cpp
 	blockcheck_tests.cpp
 	blockencodings_tests.cpp
 	blockfilter_tests.cpp
 	blockindex_tests.cpp
 	blockstatus_tests.cpp
 	bloom_tests.cpp
 	bswap_tests.cpp
 	cashaddr_tests.cpp
 	cashaddrenc_tests.cpp
 	checkdatasig_tests.cpp
 	checkpoints_tests.cpp
 	checkqueue_tests.cpp
 	coins_tests.cpp
 	compress_tests.cpp
 	config_tests.cpp
 	core_io_tests.cpp
 	crypto_tests.cpp
 	cuckoocache_tests.cpp
 	dbwrapper_tests.cpp
 	denialofservice_tests.cpp
 	dstencode_tests.cpp
 	excessiveblock_tests.cpp
 	feerate_tests.cpp
 	finalization_tests.cpp
 	flatfile_tests.cpp
 	getarg_tests.cpp
 	hash_tests.cpp
 	inv_tests.cpp
 	jsonutil.cpp
 	key_io_tests.cpp
 	key_tests.cpp
 	lcg_tests.cpp
 	limitedmap_tests.cpp
 	main_tests.cpp
 	mempool_tests.cpp
 	merkle_tests.cpp
 	miner_tests.cpp
 	monolith_opcodes_tests.cpp
 	multisig_tests.cpp
 	net_tests.cpp
 	netbase_tests.cpp
 	pmt_tests.cpp
 	policyestimator_tests.cpp
 	pow_tests.cpp
 	prevector_tests.cpp
 	radix_tests.cpp
 	raii_event_tests.cpp
 	random_tests.cpp
 	rcu_tests.cpp
 	reverselock_tests.cpp
 	rpc_tests.cpp
 	rpc_server_tests.cpp
 	rwcollection_tests.cpp
 	sanity_tests.cpp
 	scheduler_tests.cpp
 	schnorr_tests.cpp
 	script_bitfield_tests.cpp
 	script_commitment_tests.cpp
 	script_p2sh_tests.cpp
 	script_standard_tests.cpp
 	script_tests.cpp
 	scriptflags.cpp
 	scriptnum_tests.cpp
 	serialize_tests.cpp
 	sigcache_tests.cpp
 	sigencoding_tests.cpp
 	sighash_tests.cpp
 	sighashtype_tests.cpp
 	sigopcount_tests.cpp
 	sigutil.cpp
 	skiplist_tests.cpp
 	streams_tests.cpp
 	sync_tests.cpp
 	test_bitcoin.cpp
 	test_bitcoin_main.cpp
 	timedata_tests.cpp
 	torcontrol_tests.cpp
 	transaction_tests.cpp
 	txindex_tests.cpp
 	txvalidation_tests.cpp
 	txvalidationcache_tests.cpp
 	uint256_tests.cpp
 	undo_tests.cpp
 	util_tests.cpp
 	validation_block_tests.cpp
 	validation_tests.cpp
 	work_comparator_tests.cpp
 
 	# RPC Tests
 	../rpc/test/server_tests.cpp
 
 	# Tests generated from JSON
 	${JSON_HEADERS}
 )
 
 find_package(Boost 1.58 REQUIRED unit_test_framework)
 
 target_link_libraries(test_bitcoin Boost::unit_test_framework rpcclient server)
 
 # We need to detect if the BOOST_TEST_DYN_LINK flag is required.
 set(CMAKE_REQUIRED_LIBRARIES Boost::unit_test_framework)
 check_cxx_source_compiles("
 	#define BOOST_TEST_DYN_LINK
 	#define BOOST_TEST_MAIN
 	#include <boost/test/unit_test.hpp>
 " BOOST_TEST_DYN_LINK)
 
 if(BOOST_TEST_DYN_LINK)
 	target_compile_definitions(test_bitcoin PRIVATE BOOST_TEST_DYN_LINK)
 endif(BOOST_TEST_DYN_LINK)
 
 if(BUILD_BITCOIN_WALLET)
 	target_sources(test_bitcoin
 		PRIVATE
 			../wallet/test/wallet_test_fixture.cpp
 			../wallet/test/accounting_tests.cpp
 			../wallet/test/wallet_tests.cpp
 			../wallet/test/walletdb_tests.cpp
 			../wallet/test/wallet_crypto_tests.cpp
 			../wallet/test/coinselector_tests.cpp
 	)
 endif()
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index cbf2cd5159..dfe5dba637 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -1,92 +1,95 @@
 ###
 # Create config.ini file for tests
 ###
 set(abs_top_srcdir ${CMAKE_SOURCE_DIR})
 set(abs_top_builddir ${CMAKE_BINARY_DIR})
 if(CMAKE_SYSTEM_NAME MATCHES "Windows")
 	set(EXEEXT ".exe")
 endif()
 
 if(NOT BUILD_BITCOIN_WALLET)
 	set(ENABLE_WALLET_TRUE "#")
 endif()
 
 if(NOT BUILD_BITCOIN_TX OR NOT BUILD_BITCOIN_TX)
 	set(BUILD_BITCOIN_UTILS_TRUE "#")
 endif()
 if(NOT BUILD_BITCOIN_ZMQ)
 	set(ENABLE_ZMQ_TRUE "#")
 endif()
 
 # Create build ini file
 configure_file(config.ini.in config.ini @ONLY)
 
 
 ###
 # Setup symlinks for testing
 ###
 macro(make_link src dest)
   add_custom_command(
     OUTPUT "${dest}"
     COMMAND ${CMAKE_COMMAND} -E create_symlink "${src}" "${dest}"
     COMMENT "make_link ${src} -> ${dest}"
     MAIN_DEPENDENCY "${src}"
   )
 endmacro()
 
 file(MAKE_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/functional/)
 file(MAKE_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/util/)
 
 make_link(
 	${CMAKE_CURRENT_SOURCE_DIR}/functional/test_runner.py
 	${CMAKE_CURRENT_BINARY_DIR}/functional/test_runner.py
 )
 make_link(
 	${CMAKE_CURRENT_SOURCE_DIR}/functional/create_cache.py
 	${CMAKE_CURRENT_BINARY_DIR}/functional/create_cache.py
 )
 make_link(
 	${CMAKE_CURRENT_SOURCE_DIR}/util/bitcoin-util-test.py
 	${CMAKE_CURRENT_BINARY_DIR}/util/bitcoin-util-test.py
 )
 make_link(
 	${CMAKE_CURRENT_SOURCE_DIR}/util/rpcauth-test.py
 	${CMAKE_CURRENT_BINARY_DIR}/util/rpcauth-test.py
 )
 
 add_custom_target(check-functional
 	COMMAND
+		"${PYTHON_EXECUTABLE}"
 		./functional/test_runner.py
 	DEPENDS
 		../src/bitcoind
 		../src/bitcoin-cli
 		${CMAKE_CURRENT_BINARY_DIR}/functional/test_runner.py
 		${CMAKE_CURRENT_BINARY_DIR}/functional/create_cache.py
 )
 
 add_dependencies(check-all check-functional)
 
 if(BUILD_BITCOIN_TX)
 	add_custom_target(check-bitcoin-util
 		COMMAND
 			${CMAKE_COMMAND} -E echo "Running test/util/bitcoin-util-test.py..."
 		COMMAND
+			"${PYTHON_EXECUTABLE}"
 			./util/bitcoin-util-test.py
 		DEPENDS
 			../src/bitcoin-tx
 			${CMAKE_CURRENT_BINARY_DIR}/util/bitcoin-util-test.py
 	)
 
 	add_dependencies(check check-bitcoin-util)
 endif()
 
 add_custom_target(check-rpcauth
 	COMMAND
 		${CMAKE_COMMAND} -E echo "Running test/util/rpcauth-test.py..."
 	COMMAND
+		"${PYTHON_EXECUTABLE}"
 		./util/rpcauth-test.py
 	DEPENDS
 		${CMAKE_CURRENT_BINARY_DIR}/util/rpcauth-test.py
 )
 
 add_dependencies(check check-rpcauth)