We can't run the configure script on Windows, and the only thing libsodium provides
for Windows are msbuild files which do not integrate well into our CMake build system,
so we create a Windows-specific CMakeLists.txt for the project.

diff -rupN original/CMakeLists.txt patched/CMakeLists.txt
--- original/CMakeLists.txt	1970-01-01 01:00:00.000000000 +0100
+++ patched/CMakeLists.txt	2020-09-24 13:32:12.368714100 +0200
@@ -0,0 +1,146 @@
+cmake_minimum_required(VERSION 3.7)
+
+project(libsodium)
+
+set(SOURCES src/libsodium/crypto_aead/aes256gcm/aesni/aead_aes256gcm_aesni.c
+            src/libsodium/crypto_aead/chacha20poly1305/sodium/aead_chacha20poly1305.c
+            src/libsodium/crypto_aead/xchacha20poly1305/sodium/aead_xchacha20poly1305.c
+            src/libsodium/crypto_auth/crypto_auth.c
+            src/libsodium/crypto_auth/hmacsha256/auth_hmacsha256.c
+            src/libsodium/crypto_auth/hmacsha512/auth_hmacsha512.c
+            src/libsodium/crypto_auth/hmacsha512256/auth_hmacsha512256.c
+            src/libsodium/crypto_box/crypto_box.c
+            src/libsodium/crypto_box/crypto_box_easy.c
+            src/libsodium/crypto_box/crypto_box_seal.c
+            src/libsodium/crypto_box/curve25519xchacha20poly1305/box_curve25519xchacha20poly1305.c
+            src/libsodium/crypto_box/curve25519xchacha20poly1305/box_seal_curve25519xchacha20poly1305.c
+            src/libsodium/crypto_box/curve25519xsalsa20poly1305/box_curve25519xsalsa20poly1305.c
+            src/libsodium/crypto_core/ed25519/core_ed25519.c
+            src/libsodium/crypto_core/ed25519/core_ristretto255.c
+            src/libsodium/crypto_core/ed25519/ref10/ed25519_ref10.c
+            src/libsodium/crypto_core/hchacha20/core_hchacha20.c
+            src/libsodium/crypto_core/hsalsa20/core_hsalsa20.c
+            src/libsodium/crypto_core/hsalsa20/ref2/core_hsalsa20_ref2.c
+            src/libsodium/crypto_core/salsa/ref/core_salsa_ref.c
+            src/libsodium/crypto_generichash/blake2b/generichash_blake2.c
+            src/libsodium/crypto_generichash/blake2b/ref/blake2b-compress-avx2.c
+            src/libsodium/crypto_generichash/blake2b/ref/blake2b-compress-ref.c
+            src/libsodium/crypto_generichash/blake2b/ref/blake2b-compress-sse41.c
+            src/libsodium/crypto_generichash/blake2b/ref/blake2b-compress-ssse3.c
+            src/libsodium/crypto_generichash/blake2b/ref/blake2b-ref.c
+            src/libsodium/crypto_generichash/blake2b/ref/generichash_blake2b.c
+            src/libsodium/crypto_generichash/crypto_generichash.c
+            src/libsodium/crypto_hash/crypto_hash.c
+            src/libsodium/crypto_hash/sha256/cp/hash_sha256_cp.c
+            src/libsodium/crypto_hash/sha256/hash_sha256.c
+            src/libsodium/crypto_hash/sha512/cp/hash_sha512_cp.c
+            src/libsodium/crypto_hash/sha512/hash_sha512.c
+            src/libsodium/crypto_kdf/blake2b/kdf_blake2b.c
+            src/libsodium/crypto_kdf/crypto_kdf.c
+            src/libsodium/crypto_kx/crypto_kx.c
+            src/libsodium/crypto_onetimeauth/crypto_onetimeauth.c
+            src/libsodium/crypto_onetimeauth/poly1305/donna/poly1305_donna.c
+            src/libsodium/crypto_onetimeauth/poly1305/onetimeauth_poly1305.c
+            src/libsodium/crypto_onetimeauth/poly1305/sse2/poly1305_sse2.c
+            src/libsodium/crypto_pwhash/argon2/argon2-core.c
+            src/libsodium/crypto_pwhash/argon2/argon2-encoding.c
+            src/libsodium/crypto_pwhash/argon2/argon2-fill-block-avx2.c
+            src/libsodium/crypto_pwhash/argon2/argon2-fill-block-avx512f.c
+            src/libsodium/crypto_pwhash/argon2/argon2-fill-block-ref.c
+            src/libsodium/crypto_pwhash/argon2/argon2-fill-block-ssse3.c
+            src/libsodium/crypto_pwhash/argon2/argon2.c
+            src/libsodium/crypto_pwhash/argon2/blake2b-long.c
+            src/libsodium/crypto_pwhash/argon2/pwhash_argon2i.c
+            src/libsodium/crypto_pwhash/argon2/pwhash_argon2id.c
+            src/libsodium/crypto_pwhash/crypto_pwhash.c
+            src/libsodium/crypto_pwhash/scryptsalsa208sha256/crypto_scrypt-common.c
+            src/libsodium/crypto_pwhash/scryptsalsa208sha256/nosse/pwhash_scryptsalsa208sha256_nosse.c
+            src/libsodium/crypto_pwhash/scryptsalsa208sha256/pbkdf2-sha256.c
+            src/libsodium/crypto_pwhash/scryptsalsa208sha256/pwhash_scryptsalsa208sha256.c
+            src/libsodium/crypto_pwhash/scryptsalsa208sha256/scrypt_platform.c
+            src/libsodium/crypto_pwhash/scryptsalsa208sha256/sse/pwhash_scryptsalsa208sha256_sse.c
+            src/libsodium/crypto_scalarmult/crypto_scalarmult.c
+            src/libsodium/crypto_scalarmult/curve25519/ref10/x25519_ref10.c
+            src/libsodium/crypto_scalarmult/curve25519/sandy2x/curve25519_sandy2x.c
+            src/libsodium/crypto_scalarmult/curve25519/sandy2x/fe51_invert.c
+            src/libsodium/crypto_scalarmult/curve25519/sandy2x/fe_frombytes_sandy2x.c
+            src/libsodium/crypto_scalarmult/curve25519/scalarmult_curve25519.c
+            src/libsodium/crypto_scalarmult/ed25519/ref10/scalarmult_ed25519_ref10.c
+            src/libsodium/crypto_scalarmult/ristretto255/ref10/scalarmult_ristretto255_ref10.c
+            src/libsodium/crypto_secretbox/crypto_secretbox.c
+            src/libsodium/crypto_secretbox/crypto_secretbox_easy.c
+            src/libsodium/crypto_secretbox/xchacha20poly1305/secretbox_xchacha20poly1305.c
+            src/libsodium/crypto_secretbox/xsalsa20poly1305/secretbox_xsalsa20poly1305.c
+            src/libsodium/crypto_secretstream/xchacha20poly1305/secretstream_xchacha20poly1305.c
+            src/libsodium/crypto_shorthash/crypto_shorthash.c
+            src/libsodium/crypto_shorthash/siphash24/ref/shorthash_siphash24_ref.c
+            src/libsodium/crypto_shorthash/siphash24/ref/shorthash_siphashx24_ref.c
+            src/libsodium/crypto_shorthash/siphash24/shorthash_siphash24.c
+            src/libsodium/crypto_shorthash/siphash24/shorthash_siphashx24.c
+            src/libsodium/crypto_sign/crypto_sign.c
+            src/libsodium/crypto_sign/ed25519/ref10/keypair.c
+            src/libsodium/crypto_sign/ed25519/ref10/obsolete.c
+            src/libsodium/crypto_sign/ed25519/ref10/open.c
+            src/libsodium/crypto_sign/ed25519/ref10/sign.c
+            src/libsodium/crypto_sign/ed25519/sign_ed25519.c
+            src/libsodium/crypto_stream/chacha20/dolbeau/chacha20_dolbeau-avx2.c
+            src/libsodium/crypto_stream/chacha20/dolbeau/chacha20_dolbeau-ssse3.c
+            src/libsodium/crypto_stream/chacha20/ref/chacha20_ref.c
+            src/libsodium/crypto_stream/chacha20/stream_chacha20.c
+            src/libsodium/crypto_stream/crypto_stream.c
+            src/libsodium/crypto_stream/salsa20/ref/salsa20_ref.c
+            src/libsodium/crypto_stream/salsa20/stream_salsa20.c
+            src/libsodium/crypto_stream/salsa20/xmm6/salsa20_xmm6.c
+            src/libsodium/crypto_stream/salsa20/xmm6int/salsa20_xmm6int-avx2.c
+            src/libsodium/crypto_stream/salsa20/xmm6int/salsa20_xmm6int-sse2.c
+            src/libsodium/crypto_stream/salsa2012/ref/stream_salsa2012_ref.c
+            src/libsodium/crypto_stream/salsa2012/stream_salsa2012.c
+            src/libsodium/crypto_stream/salsa208/ref/stream_salsa208_ref.c
+            src/libsodium/crypto_stream/salsa208/stream_salsa208.c
+            src/libsodium/crypto_stream/xchacha20/stream_xchacha20.c
+            src/libsodium/crypto_stream/xsalsa20/stream_xsalsa20.c
+            src/libsodium/crypto_verify/sodium/verify.c
+            src/libsodium/randombytes/internal/randombytes_internal_random.c
+            src/libsodium/randombytes/randombytes.c
+            src/libsodium/randombytes/sysrandom/randombytes_sysrandom.c
+            src/libsodium/sodium/codecs.c
+            src/libsodium/sodium/core.c
+            src/libsodium/sodium/runtime.c
+            src/libsodium/sodium/utils.c
+            src/libsodium/sodium/version.c)
+
+if(WIN32)
+  configure_file(builds/msvc/version.h version.h COPYONLY)
+  configure_file(builds/msvc/resource.h resource.h COPYONLY)
+  configure_file(builds/msvc/resource.rc resource.rc COPYONLY)
+endif()
+
+add_library(sodium STATIC ${SOURCES})
+
+set_property(TARGET sodium PROPERTY POSITION_INDEPENDENT_CODE ON)
+
+target_include_directories(sodium
+                            PRIVATE
+                              ${CMAKE_BINARY_DIR}
+                              src/libsodium/include/sodium
+
+			      )
+
+if(WIN32)
+  target_compile_definitions(sodium
+                              PRIVATE
+                                WIN32
+                                HAVE_CONFIG_H
+                                SODIUM_STATIC
+                                NDEBUG
+                                _LIB)
+endif()
+
+install(TARGETS sodium
+    ARCHIVE DESTINATION lib
+)
+
+install(DIRECTORY src/libsodium/include/sodium DESTINATION include
+          FILES_MATCHING PATTERN "*.h")
+install(FILES src/libsodium/include/sodium.h DESTINATION include)
+install(FILES builds/msvc/version.h builds/msvc/resource.h DESTINATION include/sodium)