[squid-users] Error during build of version 7.1 from sources

[alex ']

Good afternoon! To build version 7.1, the gcc compiler version 9.1.1
is used. The compiler returned an error during the build process:

gadgets.cc: In function 'std::optional<SBuf> ParseAsUtf8(const ASN1_STRING&)':
gadgets.cc:483:67: error: invalid conversion from 'const ASN1_STRING*'
{aka 'const asn1_string_st*'} to 'ASN1_STRING*' {aka
'asn1_string_st*'} [-fpermissive]
  483 |     const auto conversionResult =
ASN1_STRING_to_UTF8(&utfBuffer, &asnBuffer);
      |
   ^~~~~~~~~~
      |                                                                   |
      |
   const ASN1_STRING* {aka const asn1_string_st*}
In file included from ../../compat/openssl.h:29,
                 from ../../src/security/LockingPointer.h:18,
                 from ../../src/security/forward.h:15,
                 from ../../src/security/ErrorDetail.h:15,
                 from ../../src/security/Io.h:13,
                 from gadgets.cc:15:
/usr/include/openssl/asn1.h:1000:59: note:   initializing argument 2
of 'int ASN1_STRING_to_UTF8(unsigned char**, ASN1_STRING*)'
 1000 | int ASN1_STRING_to_UTF8(unsigned char **out, ASN1_STRING *in);
      |                                              ~~~~~~~~~~~~~^~
gadgets.cc: In function 'bool addAltNameWithSubjectCn(Security::CertPointer&)':
gadgets.cc:551:95: error: invalid conversion from 'const char*' to
'char*' [-fpermissive]
  551 |     const auto ext = X509V3_EXT_conf_nid(nullptr, nullptr,
NID_subject_alt_name, altName.c_str());
      |
                  ~~~~~~~~~~~~~^~
      |
                               |
      |
                               const char*
In file included from ../../src/ssl/gadgets.h:34,
                 from ../../src/AccessLogEntry.h:31,
                 from ../../src/auth/UserRequest.h:14,
                 from ../../src/HttpRequest.h:24,
                 from ../../src/ssl/ErrorDetailManager.h:13,
                 from ../../src/security/ErrorDetail.h:19,
                 from ../../src/security/Io.h:13,
                 from gadgets.cc:15:
/usr/include/openssl/x509v3.h:613:28: note:   initializing argument 4
of 'X509_EXTENSION* X509V3_EXT_conf_nid(lhash_st_CONF_VALUE*,
X509V3_CTX*, int, char*)'
  613 |         int ext_nid, char *value);
      |                      ~~~~~~^~~~~

I build on CentOS 6.10 with and using the latest devtoolset-9 package