main fails to compile

[mouse07410]

MacOS Sonoma 14.1.2, Xcode-15.1

[ 25%] Building C object ref/CMakeFiles/test_kyber512_ref.dir/test_kyber.c.o
/Users/ur20980/src/kyber/ref/test_kyber.c:9:21: error: a function declaration without a prototype is deprecated in all versions of C [-Werror,-Wstrict-prototypes]
static int test_keys()
                    ^
                     void
/Users/ur20980/src/kyber/ref/test_kyber.c:34:29: error: a function declaration without a prototype is deprecated in all versions of C [-Werror,-Wstrict-prototypes]
static int test_invalid_sk_a()
                            ^
                             void
/Users/ur20980/src/kyber/ref/test_kyber.c:62:35: error: a function declaration without a prototype is deprecated in all versions of C [-Werror,-Wstrict-prototypes]
static int test_invalid_ciphertext()
                                  ^
                                   void
3 errors generated.

Proposed fix is obvious (it also addresses the fact that MacOS has shasum, but not sha256sum):

index 313ab24..6bc127d 100644
--- a/ref/CMakeLists.txt
+++ b/ref/CMakeLists.txt
@@ -114,4 +114,8 @@ else()
   add_test(NAME vectors1024-90s_ref COMMAND sh -c "\"$<TARGET_FILE:test_vectors1024-90s_ref>\" > tvecs1024-90s")
 endif()
 
-add_test(NAME hashes COMMAND sha256sum -c ../../SHA256SUMS)
+if (DARWIN)
+  add_test(NAME hashes COMMAND shasum -a 256 -c ../../SHA256SUMS)
+else()
+  add_test(NAME hashes COMMAND sha256sum -c ../../SHA256SUMS)
+endif(DARWIN)
diff --git a/ref/test_kyber.c b/ref/test_kyber.c
index 0f28af5..cac6b41 100644
--- a/ref/test_kyber.c
+++ b/ref/test_kyber.c
@@ -6,7 +6,7 @@
 
 #define NTESTS 1000
 
-static int test_keys()
+static int test_keys(void)
 {
   uint8_t pk[CRYPTO_PUBLICKEYBYTES];
   uint8_t sk[CRYPTO_SECRETKEYBYTES];
@@ -31,7 +31,7 @@ static int test_keys()
   return 0;
 }
 
-static int test_invalid_sk_a()
+static int test_invalid_sk_a(void)
 {
   uint8_t pk[CRYPTO_PUBLICKEYBYTES];
   uint8_t sk[CRYPTO_SECRETKEYBYTES];
@@ -59,7 +59,7 @@ static int test_invalid_sk_a()
   return 0;
 }
 
-static int test_invalid_ciphertext()
+static int test_invalid_ciphertext(void)
 {
   uint8_t pk[CRYPTO_PUBLICKEYBYTES];
   uint8_t sk[CRYPTO_SECRETKEYBYTES];