app-crypt/trousers-0.3.3-r61 fails to build with dev-libs/openssl-1.1.0f.

trousers is a fork of an upstream package [0] that is now a cros_workon package. 0.3.3-r61 corresponds to commit:
31f4933a54cce7b157619eb1dd14ea32bec39279
trousers: include tcsd as a boot services dependency.

[0] https://sourceforge.net/p/trousers/trousers/ci/master/tree/

Upstream is at version 0.3.14 which does support OpenSSL 1.1 via commit:
05411ea68746acbaf4e69295be50b9a47cddb2fd
[PATCH] support OpenSSL 1.1.0

Upstream gentoo now uses 0.3.14-r1 which includes this patch.

For the record, the failure is:
crypto/openssl/rsa.c:71:5: error: incomplete definition of type 'struct rsa_st'
        rsa->n = BN_bin2bn(publicKey, keysize, rsa->n);
        ~~~^
/usr/include/openssl/ossl_typ.h:110:16: note: forward declaration of 'struct rsa_st'
typedef struct rsa_st RSA;
               ^
crypto/openssl/rsa.c:71:44: error: incomplete definition of type 'struct rsa_st'
        rsa->n = BN_bin2bn(publicKey, keysize, rsa->n);
                                               ~~~^
/usr/include/openssl/ossl_typ.h:110:16: note: forward declaration of 'struct rsa_st'
typedef struct rsa_st RSA;
               ^
crypto/openssl/rsa.c:73:5: error: incomplete definition of type 'struct rsa_st'
        rsa->e = BN_bin2bn(exp, sizeof(exp), rsa->e);
        ~~~^
/usr/include/openssl/ossl_typ.h:110:16: note: forward declaration of 'struct rsa_st'
typedef struct rsa_st RSA;
               ^
crypto/openssl/rsa.c:73:42: error: incomplete definition of type 'struct rsa_st'
        rsa->e = BN_bin2bn(exp, sizeof(exp), rsa->e);
                                             ~~~^
/usr/include/openssl/ossl_typ.h:110:16: note: forward declaration of 'struct rsa_st'
typedef struct rsa_st RSA;
               ^
crypto/openssl/rsa.c:75:9: error: incomplete definition of type 'struct rsa_st'
        if (rsa->n == NULL || rsa->e == NULL) {
            ~~~^
/usr/include/openssl/ossl_typ.h:110:16: note: forward declaration of 'struct rsa_st'
typedef struct rsa_st RSA;
               ^
crypto/openssl/rsa.c:75:27: error: incomplete definition of type 'struct rsa_st'
        if (rsa->n == NULL || rsa->e == NULL) {
                              ~~~^
/usr/include/openssl/ossl_typ.h:110:16: note: forward declaration of 'struct rsa_st'
typedef struct rsa_st RSA;
               ^
crypto/openssl/rsa.c:149:5: error: incomplete definition of type 'struct rsa_st'
        rsa->n = BN_bin2bn(pModulus, iKeyLength, rsa->n);
        ~~~^
/usr/include/openssl/ossl_typ.h:110:16: note: forward declaration of 'struct rsa_st'
typedef struct rsa_st RSA;
               ^
crypto/openssl/rsa.c:149:46: error: incomplete definition of type 'struct rsa_st'
        rsa->n = BN_bin2bn(pModulus, iKeyLength, rsa->n);
                                                 ~~~^
/usr/include/openssl/ossl_typ.h:110:16: note: forward declaration of 'struct rsa_st'
typedef struct rsa_st RSA;
               ^
crypto/openssl/rsa.c:151:5: error: incomplete definition of type 'struct rsa_st'
        rsa->e = BN_bin2bn(exp, sizeof(exp), rsa->e);
        ~~~^
/usr/include/openssl/ossl_typ.h:110:16: note: forward declaration of 'struct rsa_st'
typedef struct rsa_st RSA;
               ^
crypto/openssl/rsa.c:151:42: error: incomplete definition of type 'struct rsa_st'
        rsa->e = BN_bin2bn(exp, sizeof(exp), rsa->e);
                                             ~~~^
/usr/include/openssl/ossl_typ.h:110:16: note: forward declaration of 'struct rsa_st'
typedef struct rsa_st RSA;
               ^
crypto/openssl/rsa.c:153:9: error: incomplete definition of type 'struct rsa_st'
        if (rsa->n == NULL || rsa->e == NULL) {
            ~~~^
/usr/include/openssl/ossl_typ.h:110:16: note: forward declaration of 'struct rsa_st'
typedef struct rsa_st RSA;
               ^
crypto/openssl/rsa.c:153:27: error: incomplete definition of type 'struct rsa_st'
        if (rsa->n == NULL || rsa->e == NULL) {
                              ~~~^
/usr/include/openssl/ossl_typ.h:110:16: note: forward declaration of 'struct rsa_st'
typedef struct rsa_st RSA;
               ^
crypto/openssl/rsa.c:240:5: error: incomplete definition of type 'struct rsa_st'
        rsa->n = BN_bin2bn(pubkey, pubsize, rsa->n);
        ~~~^
/usr/include/openssl/ossl_typ.h:110:16: note: forward declaration of 'struct rsa_st'
typedef struct rsa_st RSA;
               ^
crypto/openssl/rsa.c:240:41: error: incomplete definition of type 'struct rsa_st'
        rsa->n = BN_bin2bn(pubkey, pubsize, rsa->n);
                                            ~~~^
/usr/include/openssl/ossl_typ.h:110:16: note: forward declaration of 'struct rsa_st'
typedef struct rsa_st RSA;
               ^
crypto/openssl/rsa.c:242:5: error: incomplete definition of type 'struct rsa_st'
        rsa->e = BN_bin2bn(exp, e_size, rsa->e);
        ~~~^
/usr/include/openssl/ossl_typ.h:110:16: note: forward declaration of 'struct rsa_st'
typedef struct rsa_st RSA;
               ^
crypto/openssl/rsa.c:242:37: error: incomplete definition of type 'struct rsa_st'
        rsa->e = BN_bin2bn(exp, e_size, rsa->e);
                                        ~~~^
/usr/include/openssl/ossl_typ.h:110:16: note: forward declaration of 'struct rsa_st'
typedef struct rsa_st RSA;
               ^
crypto/openssl/rsa.c:244:9: error: incomplete definition of type 'struct rsa_st'
        if (rsa->n == NULL || rsa->e == NULL) {
            ~~~^
/usr/include/openssl/ossl_typ.h:110:16: note: forward declaration of 'struct rsa_st'
typedef struct rsa_st RSA;
               ^
crypto/openssl/rsa.c:244:27: error: incomplete definition of type 'struct rsa_st'
        if (rsa->n == NULL || rsa->e == NULL) {
                              ~~~^
/usr/include/openssl/ossl_typ.h:110:16: note: forward declaration of 'struct rsa_st'
typedef struct rsa_st RSA;
               ^
18 errors generated.

crypto/openssl/symmetric.c:55:17: error: variable has incomplete type 'EVP_CIPHER_CTX' (aka 'struct evp_cipher_ctx_st')
        EVP_CIPHER_CTX ctx;
                       ^
/usr/include/openssl/ossl_typ.h:90:16: note: forward declaration of 'struct evp_cipher_ctx_st'
typedef struct evp_cipher_ctx_st EVP_CIPHER_CTX;
               ^
crypto/openssl/symmetric.c:102:17: error: variable has incomplete type 'EVP_CIPHER_CTX' (aka 'struct evp_cipher_ctx_st')
        EVP_CIPHER_CTX ctx;
                       ^
/usr/include/openssl/ossl_typ.h:90:16: note: forward declaration of 'struct evp_cipher_ctx_st'
typedef struct evp_cipher_ctx_st EVP_CIPHER_CTX;
               ^
crypto/openssl/symmetric.c:258:17: error: variable has incomplete type 'EVP_CIPHER_CTX' (aka 'struct evp_cipher_ctx_st')
        EVP_CIPHER_CTX ctx;
                       ^
/usr/include/openssl/ossl_typ.h:90:16: note: forward declaration of 'struct evp_cipher_ctx_st'
typedef struct evp_cipher_ctx_st EVP_CIPHER_CTX;
               ^
crypto/openssl/symmetric.c:332:17: error: variable has incomplete type 'EVP_CIPHER_CTX' (aka 'struct evp_cipher_ctx_st')
        EVP_CIPHER_CTX ctx;
                       ^
/usr/include/openssl/ossl_typ.h:90:16: note: forward declaration of 'struct evp_cipher_ctx_st'
typedef struct evp_cipher_ctx_st EVP_CIPHER_CTX;
               ^
4 errors generated.

crypto/openssl/hash.c:59:13: error: variable has incomplete type 'EVP_MD_CTX' (aka 'struct evp_md_ctx_st')
        EVP_MD_CTX md_ctx;
                   ^
/usr/include/openssl/ossl_typ.h:92:16: note: forward declaration of 'struct evp_md_ctx_st'
typedef struct evp_md_ctx_st EVP_MD_CTX;
               ^
crypto/openssl/hash.c:115:25: error: invalid application of 'sizeof' to an incomplete type 'EVP_MD_CTX' (aka 'struct evp_md_ctx_st')
        if ((ctx->ctx = malloc(sizeof(EVP_MD_CTX))) == NULL)
                               ^     ~~~~~~~~~~~~
/usr/include/openssl/ossl_typ.h:92:16: note: forward declaration of 'struct evp_md_ctx_st'
typedef struct evp_md_ctx_st EVP_MD_CTX;
               ^