title: How to install OpenSSL for Python
body: <p>I need to install OpenSSL on my python2.7.</p>
  <p>I tried</p>
  <pre><code>$ pip install pyopenssl
  </code></pre>
  <p>And I got the following</p>
  <pre><code>/usr/local/lib/python2.7/distutils/dist.py:267: UserWarning: Unknown distribution option: 'zip_safe'
    warnings.warn(msg)
  running build
  running build_py
  running build_ext
  building 'OpenSSL.crypto' extension
  gcc -pthread -fno-strict-aliasing -g -O2 -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -fPIC -I/usr/local/include/python2.7 -c OpenSSL/crypto/crypto.c -o build/temp.linux-x86_64-2.7/OpenSSL/crypto/crypto.o
  In file included from OpenSSL/crypto/crypto.h:17,
                   from OpenSSL/crypto/crypto.c:15:
  OpenSSL/crypto/x509.h:17:25: error: openssl/ssl.h: No such file or directory
  In file included from OpenSSL/crypto/crypto.h:17,
                   from OpenSSL/crypto/crypto.c:15:
  OpenSSL/crypto/x509.h:25: error: expected specifier-qualifier-list before ‘X509’
  OpenSSL/crypto/x509.h:29: error: expected declaration specifiers or ‘...’ before ‘ASN1_TIME’
  OpenSSL/crypto/x509.h:30: error: expected declaration specifiers or ‘...’ before ‘ASN1_TIME’
  In file included from OpenSSL/crypto/crypto.h:18,
                   from OpenSSL/crypto/crypto.c:15:
  OpenSSL/crypto/x509name.h:27: error: expected specifier-qualifier-list before ‘X509_NAME’
  In file included from OpenSSL/crypto/crypto.h:19,
                   from OpenSSL/crypto/crypto.c:15:
  OpenSSL/crypto/netscape_spki.h:24: error: expected specifier-qualifier-list before ‘NETSCAPE_SPKI’
  In file included from OpenSSL/crypto/crypto.h:20,
                   from OpenSSL/crypto/crypto.c:15:
  OpenSSL/crypto/x509store.h:25: error: expected specifier-qualifier-list before ‘X509_STORE’
  In file included from OpenSSL/crypto/crypto.h:21,
                   from OpenSSL/crypto/crypto.c:15:
  OpenSSL/crypto/x509req.h:25: error: expected specifier-qualifier-list before ‘X509_REQ’
  In file included from OpenSSL/crypto/crypto.h:22,
                   from OpenSSL/crypto/crypto.c:15:
  OpenSSL/crypto/pkey.h:27: error: expected specifier-qualifier-list before ‘EVP_PKEY’
  In file included from OpenSSL/crypto/crypto.h:23,
                   from OpenSSL/crypto/crypto.c:15:
  OpenSSL/crypto/x509ext.h:16:28: error: openssl/x509v3.h: No such file or directory
  In file included from OpenSSL/crypto/crypto.h:23,
                   from OpenSSL/crypto/crypto.c:15:
  OpenSSL/crypto/x509ext.h:28: error: expected specifier-qualifier-list before ‘X509_EXTENSION’
  In file included from OpenSSL/crypto/crypto.h:24,
                   from OpenSSL/crypto/crypto.c:15:
  OpenSSL/crypto/pkcs7.h:15:27: error: openssl/pkcs7.h: No such file or directory
  In file included from OpenSSL/crypto/crypto.h:24,
                   from OpenSSL/crypto/crypto.c:15:
  OpenSSL/crypto/pkcs7.h:25: error: expected specifier-qualifier-list before ‘PKCS7’
  In file included from OpenSSL/crypto/crypto.h:25,
                   from OpenSSL/crypto/crypto.c:15:
  OpenSSL/crypto/pkcs12.h:14:28: error: openssl/pkcs12.h: No such file or directory
  OpenSSL/crypto/pkcs12.h:15:26: error: openssl/asn1.h: No such file or directory
  In file included from OpenSSL/crypto/crypto.h:25,
                   from OpenSSL/crypto/crypto.c:15:
  OpenSSL/crypto/pkcs12.h:37: error: expected ‘)’ before ‘*’ token
  In file included from OpenSSL/crypto/crypto.h:26,
                   from OpenSSL/crypto/crypto.c:15:
  OpenSSL/crypto/crl.h:14: error: expected specifier-qualifier-list before ‘X509_CRL’
  OpenSSL/crypto/crl.h:17: error: expected ‘)’ before ‘*’ token
  In file included from OpenSSL/crypto/crypto.h:27,
                   from OpenSSL/crypto/crypto.c:15:
  OpenSSL/crypto/revoked.h:12: error: expected specifier-qualifier-list before ‘X509_REVOKED’
  OpenSSL/crypto/revoked.h:16: error: expected ‘)’ before ‘*’ token
  In file included from OpenSSL/crypto/crypto.h:28,
                   from OpenSSL/crypto/crypto.c:15:
  OpenSSL/crypto/../util.h:17:25: error: openssl/err.h: No such file or directory
  In file included from OpenSSL/crypto/crypto.c:15:
  OpenSSL/crypto/crypto.h:74: error: expected ‘)’ before ‘*’ token
  OpenSSL/crypto/crypto.h:75: error: expected ‘)’ before ‘*’ token
  OpenSSL/crypto/crypto.h:76: error: expected ‘)’ before ‘*’ token
  OpenSSL/crypto/crypto.h:77: error: expected ‘)’ before ‘*’ token
  OpenSSL/crypto/crypto.h:78: error: expected ‘)’ before ‘*’ token
  OpenSSL/crypto/crypto.h:80: error: expected ‘)’ before ‘*’ token
  OpenSSL/crypto/crypto.h:81: error: expected ‘)’ before ‘*’ token
  OpenSSL/crypto/crypto.c: In function ‘crypto_load_privatekey’:
  OpenSSL/crypto/crypto.c:78: error: expected ‘)’ before ‘*’ token
  OpenSSL/crypto/crypto.c:82: error: ‘pem_password_cb’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:82: error: (Each undeclared identifier is reported only once
  OpenSSL/crypto/crypto.c:82: error: for each function it appears in.)
  OpenSSL/crypto/crypto.c:82: error: ‘cb’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:84: error: ‘BIO’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:84: error: ‘bio’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:85: error: ‘EVP_PKEY’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:85: error: ‘pkey’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:109: warning: implicit declaration of function ‘BIO_new_mem_buf’
  OpenSSL/crypto/crypto.c:112: error: ‘X509_FILETYPE_PEM’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:113: warning: implicit declaration of function ‘PEM_read_bio_PrivateKey’
  OpenSSL/crypto/crypto.c:116: error: ‘X509_FILETYPE_ASN1’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:117: warning: implicit declaration of function ‘d2i_PrivateKey_bio’
  OpenSSL/crypto/crypto.c:122: warning: implicit declaration of function ‘BIO_free’
  OpenSSL/crypto/crypto.c:133: warning: implicit declaration of function ‘crypto_PKey_New’
  OpenSSL/crypto/crypto.c: In function ‘crypto_dump_privatekey’:
  OpenSSL/crypto/crypto.c:157: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘*’ token
  OpenSSL/crypto/crypto.c:157: error: ‘cipher’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:159: error: ‘pem_password_cb’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:159: error: ‘cb’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:161: error: ‘BIO’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:161: error: ‘bio’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:162: error: ‘RSA’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:162: error: ‘rsa’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:176: warning: implicit declaration of function ‘EVP_get_cipherbyname’
  OpenSSL/crypto/crypto.c:199: warning: implicit declaration of function ‘BIO_new’
  OpenSSL/crypto/crypto.c:199: warning: implicit declaration of function ‘BIO_s_mem’
  OpenSSL/crypto/crypto.c:202: error: ‘X509_FILETYPE_PEM’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:203: warning: implicit declaration of function ‘PEM_write_bio_PrivateKey’
  OpenSSL/crypto/crypto.c:203: error: ‘crypto_PKeyObj’ has no member named ‘pkey’
  OpenSSL/crypto/crypto.c:211: error: ‘X509_FILETYPE_ASN1’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:212: warning: implicit declaration of function ‘i2d_PrivateKey_bio’
  OpenSSL/crypto/crypto.c:212: error: ‘crypto_PKeyObj’ has no member named ‘pkey’
  OpenSSL/crypto/crypto.c:216: warning: implicit declaration of function ‘EVP_PKEY_get1_RSA’
  OpenSSL/crypto/crypto.c:216: error: ‘crypto_PKeyObj’ has no member named ‘pkey’
  OpenSSL/crypto/crypto.c:217: warning: implicit declaration of function ‘RSA_print’
  OpenSSL/crypto/crypto.c:218: warning: implicit declaration of function ‘RSA_free’
  OpenSSL/crypto/crypto.c:234: warning: implicit declaration of function ‘BIO_get_mem_data’
  OpenSSL/crypto/crypto.c: In function ‘crypto_load_certificate’:
  OpenSSL/crypto/crypto.c:252: error: expected ‘)’ before ‘*’ token
  OpenSSL/crypto/crypto.c:255: error: ‘BIO’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:255: error: ‘bio’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:256: error: ‘X509’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:256: error: ‘cert’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:264: error: ‘X509_FILETYPE_PEM’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:265: warning: implicit declaration of function ‘PEM_read_bio_X509’
  OpenSSL/crypto/crypto.c:268: error: ‘X509_FILETYPE_ASN1’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:269: warning: implicit declaration of function ‘d2i_X509_bio’
  OpenSSL/crypto/crypto.c:285: warning: implicit declaration of function ‘crypto_X509_New’
  OpenSSL/crypto/crypto.c: In function ‘crypto_dump_certificate’:
  OpenSSL/crypto/crypto.c:302: error: ‘BIO’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:302: error: ‘bio’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:312: error: ‘X509_FILETYPE_PEM’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:313: warning: implicit declaration of function ‘PEM_write_bio_X509’
  OpenSSL/crypto/crypto.c:313: error: ‘crypto_X509Obj’ has no member named ‘x509’
  OpenSSL/crypto/crypto.c:316: error: ‘X509_FILETYPE_ASN1’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:317: warning: implicit declaration of function ‘i2d_X509_bio’
  OpenSSL/crypto/crypto.c:317: error: ‘crypto_X509Obj’ has no member named ‘x509’
  OpenSSL/crypto/crypto.c:321: warning: implicit declaration of function ‘X509_print_ex’
  OpenSSL/crypto/crypto.c:321: error: ‘crypto_X509Obj’ has no member named ‘x509’
  OpenSSL/crypto/crypto.c: In function ‘crypto_load_certificate_request’:
  OpenSSL/crypto/crypto.c:355: error: expected ‘)’ before ‘*’ token
  OpenSSL/crypto/crypto.c:358: error: ‘BIO’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:358: error: ‘bio’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:359: error: ‘X509_REQ’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:359: error: ‘req’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:367: error: ‘X509_FILETYPE_PEM’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:368: warning: implicit declaration of function ‘PEM_read_bio_X509_REQ’
  OpenSSL/crypto/crypto.c:371: error: ‘X509_FILETYPE_ASN1’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:372: warning: implicit declaration of function ‘d2i_X509_REQ_bio’
  OpenSSL/crypto/crypto.c:388: warning: implicit declaration of function ‘crypto_X509Req_New’
  OpenSSL/crypto/crypto.c: In function ‘crypto_dump_certificate_request’:
  OpenSSL/crypto/crypto.c:405: error: ‘BIO’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:405: error: ‘bio’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:415: error: ‘X509_FILETYPE_PEM’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:416: warning: implicit declaration of function ‘PEM_write_bio_X509_REQ’
  OpenSSL/crypto/crypto.c:416: error: ‘crypto_X509ReqObj’ has no member named ‘x509_req’
  OpenSSL/crypto/crypto.c:419: error: ‘X509_FILETYPE_ASN1’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:420: warning: implicit declaration of function ‘i2d_X509_REQ_bio’
  OpenSSL/crypto/crypto.c:420: error: ‘crypto_X509ReqObj’ has no member named ‘x509_req’
  OpenSSL/crypto/crypto.c:424: warning: implicit declaration of function ‘X509_REQ_print_ex’
  OpenSSL/crypto/crypto.c:424: error: ‘crypto_X509ReqObj’ has no member named ‘x509_req’
  OpenSSL/crypto/crypto.c: In function ‘crypto_load_crl’:
  OpenSSL/crypto/crypto.c:460: error: ‘BIO’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:460: error: ‘bio’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:461: error: ‘X509_CRL’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:461: error: ‘crl’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:469: error: ‘X509_FILETYPE_PEM’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:470: warning: implicit declaration of function ‘PEM_read_bio_X509_CRL’
  OpenSSL/crypto/crypto.c:473: error: ‘X509_FILETYPE_ASN1’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:474: warning: implicit declaration of function ‘d2i_X509_CRL_bio’
  OpenSSL/crypto/crypto.c:489: warning: implicit declaration of function ‘crypto_CRL_New’
  OpenSSL/crypto/crypto.c: In function ‘crypto_load_pkcs7_data’:
  OpenSSL/crypto/crypto.c:505: error: ‘BIO’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:505: error: ‘bio’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:506: error: ‘PKCS7’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:506: error: ‘pkcs7’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:517: error: ‘X509_FILETYPE_PEM’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:518: warning: implicit declaration of function ‘PEM_read_bio_PKCS7’
  OpenSSL/crypto/crypto.c:521: error: ‘X509_FILETYPE_ASN1’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:522: warning: implicit declaration of function ‘d2i_PKCS7_bio’
  OpenSSL/crypto/crypto.c:541: warning: implicit declaration of function ‘crypto_PKCS7_New’
  OpenSSL/crypto/crypto.c: In function ‘crypto_load_pkcs12’:
  OpenSSL/crypto/crypto.c:557: error: ‘BIO’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:557: error: ‘bio’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:558: error: ‘PKCS12’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:558: error: ‘p12’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:564: warning: implicit declaration of function ‘d2i_PKCS12_bio’
  OpenSSL/crypto/crypto.c:572: warning: implicit declaration of function ‘crypto_PKCS12_New’
  OpenSSL/crypto/crypto.c: In function ‘crypto_X509_verify_cert_error_string’:
  OpenSSL/crypto/crypto.c:592: warning: implicit declaration of function ‘X509_verify_cert_error_string’
  OpenSSL/crypto/crypto.c:592: warning: assignment makes pointer from integer without a cast
  OpenSSL/crypto/crypto.c: In function ‘crypto_sign’:
  OpenSSL/crypto/crypto.c:623: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘*’ token
  OpenSSL/crypto/crypto.c:623: error: ‘digest’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:624: error: ‘EVP_MD_CTX’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:624: error: expected ‘;’ before ‘md_ctx’
  OpenSSL/crypto/crypto.c:633: warning: implicit declaration of function ‘EVP_get_digestbyname’
  OpenSSL/crypto/crypto.c:638: warning: implicit declaration of function ‘EVP_SignInit’
  OpenSSL/crypto/crypto.c:638: error: ‘md_ctx’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:639: warning: implicit declaration of function ‘EVP_SignUpdate’
  OpenSSL/crypto/crypto.c:641: warning: implicit declaration of function ‘EVP_SignFinal’
  OpenSSL/crypto/crypto.c:641: error: ‘crypto_PKeyObj’ has no member named ‘pkey’
  OpenSSL/crypto/crypto.c: In function ‘crypto_verify’:
  OpenSSL/crypto/crypto.c:669: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘*’ token
  OpenSSL/crypto/crypto.c:669: error: ‘digest’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:670: error: ‘EVP_MD_CTX’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:670: error: expected ‘;’ before ‘md_ctx’
  OpenSSL/crypto/crypto.c:671: error: ‘EVP_PKEY’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:671: error: ‘pkey’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:686: warning: implicit declaration of function ‘X509_get_pubkey’
  OpenSSL/crypto/crypto.c:686: error: ‘crypto_X509Obj’ has no member named ‘x509’
  OpenSSL/crypto/crypto.c:692: warning: implicit declaration of function ‘EVP_VerifyInit’
  OpenSSL/crypto/crypto.c:692: error: ‘md_ctx’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:693: warning: implicit declaration of function ‘EVP_VerifyUpdate’
  OpenSSL/crypto/crypto.c:694: warning: implicit declaration of function ‘EVP_VerifyFinal’
  OpenSSL/crypto/crypto.c:695: warning: implicit declaration of function ‘EVP_PKEY_free’
  OpenSSL/crypto/crypto.c: In function ‘locking_function’:
  OpenSSL/crypto/crypto.c:741: error: ‘CRYPTO_LOCK’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c: In function ‘init_openssl_threads’:
  OpenSSL/crypto/crypto.c:758: warning: implicit declaration of function ‘CRYPTO_num_locks’
  OpenSSL/crypto/crypto.c:765: warning: implicit declaration of function ‘CRYPTO_set_id_callback’
  OpenSSL/crypto/crypto.c:766: warning: implicit declaration of function ‘CRYPTO_set_locking_callback’
  OpenSSL/crypto/crypto.c: In function ‘initcrypto’:
  OpenSSL/crypto/crypto.c:814: warning: implicit declaration of function ‘ERR_load_crypto_strings’
  OpenSSL/crypto/crypto.c:815: warning: implicit declaration of function ‘OpenSSL_add_all_algorithms’
  OpenSSL/crypto/crypto.c:829: error: ‘crypto_X509_New’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:830: error: ‘crypto_X509Name_New’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:831: error: ‘crypto_X509Req_New’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:832: error: ‘crypto_X509Store_New’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:833: error: ‘crypto_PKey_New’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:835: error: ‘crypto_PKCS7_New’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:836: error: ‘crypto_NetscapeSPKI_New’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:848: error: ‘X509_FILETYPE_PEM’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:849: error: ‘X509_FILETYPE_ASN1’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:852: error: ‘EVP_PKEY_RSA’ undeclared (first use in this function)
  OpenSSL/crypto/crypto.c:853: error: ‘EVP_PKEY_DSA’ undeclared (first use in this function)
  error: command 'gcc' failed with exit status 1
  </code></pre>
  <p>Does anybody know the reason?</p>
  <p><strong>System</strong>: Ubuntu 10.04</p>