building failed

[JamesOlvertone]

/usr/bin/cc -fstack-protector -W -Wall -Wformat=2 -Wshadow -g -O2   -c -o main.o main.c
In file included from lib/nettools.h:32,
                 from lib/compat_sha1.h:32,
                 from main.c:33:
lib/net_addr.h: In function ‘ipv4_is_private’:
lib/net_addr.h:185:20: warning: bitwise comparison always evaluates to false [-Wtautological-compare]
  185 |     ((a[0] & 0xc0) == 224)
      |                    ^~
In file included from main.c:33:
lib/compat_sha1.h: At top level:
lib/compat_sha1.h:38:2: error: #error "No SHA-1 calculation function available!"
   38 | #error "No SHA-1 calculation function available!"
      |  ^~~~~
main.c: In function ‘get_sums’:
main.c:134:22: error: storage size of ‘sha1_ctx’ isn’t known
  134 |   struct compat_sha1 sha1_ctx;
      |                      ^~~~~~~~
main.c:144:5: warning: implicit declaration of function ‘compat_sha1_init’ [-Wimplicit-function-declaration]
  144 |     compat_sha1_init(&sha1_ctx);
      |     ^~~~~~~~~~~~~~~~
main.c:159:9: warning: implicit declaration of function ‘compat_sha1_update’ [-Wimplicit-function-declaration]
  159 |         compat_sha1_update(&sha1_ctx, data, (size_t) ret);
      |         ^~~~~~~~~~~~~~~~~~
main.c:171:5: warning: implicit declaration of function ‘compat_sha1_final’ [-Wimplicit-function-declaration]
  171 |     compat_sha1_final(&sha1_ctx, sha1);
      |     ^~~~~~~~~~~~~~~~~
main.c:134:22: warning: unused variable ‘sha1_ctx’ [-Wunused-variable]
  134 |   struct compat_sha1 sha1_ctx;
      |                      ^~~~~~~~