Error when installing clamav

mkmf.log

have_header: checking for clamav.h... -------------------- no

"clang -o conftest -I/Users/agw13/.asdf/installs/ruby/2.4.1/include/ruby-2.4.0/x86_64-darwin18 -I/Users/agw13/.asdf/installs/ruby/2.4.1/include/ruby-2.4.0/ruby/backward -I/Users/agw13/.asdf/installs/ruby/2.4.1/include/ruby-2.4.0 -I. -I/Users/agw13/.asdf/installs/ruby/2.4.1/include  -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -D_DARWIN_UNLIMITED_SELECT -D_REENTRANT    -O3 -Wno-error=shorten-64-to-32  -pipe conftest.c  -L. -L/Users/agw13/.asdf/installs/ruby/2.4.1/lib -L. -L/Users/agw13/.asdf/installs/ruby/2.4.1/lib  -fstack-protector -L/usr/local/lib     -lruby-static -framework CoreFoundation  -lpthread -lgmp -ldl -lobjc "
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: int main(int argc, char **argv)
4: {
5:   return 0;
6: }
/* end */

"clang -E -I/Users/agw13/.asdf/installs/ruby/2.4.1/include/ruby-2.4.0/x86_64-darwin18 -I/Users/agw13/.asdf/installs/ruby/2.4.1/include/ruby-2.4.0/ruby/backward -I/Users/agw13/.asdf/installs/ruby/2.4.1/include/ruby-2.4.0 -I. -I/Users/agw13/.asdf/installs/ruby/2.4.1/include  -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -D_DARWIN_UNLIMITED_SELECT -D_REENTRANT    -O3 -Wno-error=shorten-64-to-32  -pipe  conftest.c -o conftest.i"
In file included from conftest.c:3:
/usr/local/include/clamav.h:31:10: fatal error: 'openssl/ssl.h' file not found
#include <openssl/ssl.h>
         ^~~~~~~~~~~~~~~
1 error generated.
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <clamav.h>
/* end */

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