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cc -Wall -I/usr/local/opt/openssl/include  -o encryption.o  -c encryption.c
encryption.c:35:28: error: unknown type name 'uint8_t'
 void dump_hex(char *label, uint8_t *buf, int len)
                            ^
encryption.c:45:30: error: unknown type name 'uint8_t'
                              uint8_t      **pubk,     // out (must free)
                              ^
encryption.c:97:39: error: unknown type name 'uint8_t'
                                       uint8_t       **epubk,         // out (must free)
                                       ^
encryption.c:99:39: error: unknown type name 'uint8_t'
                                       uint8_t       **skey,          // out (must free)
                                       ^
encryption.c:132:42: error: unknown type name 'uint8_t'
                                    const uint8_t   *pubk,
                                          ^
encryption.c: In function 'ec_key_public_key_bin_to_point':
encryption.c:141:29: warning: passing argument 1 of 'BN_bin2bn' from incompatible pointer type [-Wincompatible-pointer-types]
         pubk_bn = BN_bin2bn(pubk, pubk_len, NULL);
                             ^
In file included from encryption.c:10:0:
/usr/include/openssl/bn.h:442:9: note: expected 'const unsigned char *' but argument is of type 'const int *'
 BIGNUM *BN_bin2bn(const unsigned char *s, int len, BIGNUM *ret);```

Failed cd encryption && make:
clang -Wall -I/usr/local/opt/openssl/include  -o encryption.o  -c encryption.c
make: clang: Command not found
Makefile:9: recipe for target 'all' failed
make: *** [all] Error 127