问题一：

./sshcrypto.c:25: error: field ‘key’ has incomplete type

./sshcrypto.c:30: error: expected specifier-qualifier-list before ‘des_key_schedule’

./sshcrypto.c: In function ‘blowfish_encrypt’:

./sshcrypto.c:131: error: ‘BF_ENCRYPT’ undeclared (first use in this function)

./sshcrypto.c:131: error: (Each undeclared identifier is reported only once

./sshcrypto.c:131: error: for each function it appears in.)

./sshcrypto.c: In function ‘blowfish_decrypt’:

./sshcrypto.c:143: error: ‘BF_DECRYPT’ undeclared (first use in this function)

./sshcrypto.c: In function ‘des3_init’:

./sshcrypto.c:156: error: ‘struct des3_state’ has no member named ‘k1’

./sshcrypto.c:157: error: ‘struct des3_state’ has no member named ‘k2’

./sshcrypto.c:160: error: ‘struct des3_state’ has no member named ‘k3’

./sshcrypto.c:162: error: ‘struct des3_state’ has no member named ‘k3’

./sshcrypto.c:164: error: ‘struct des3_state’ has no member named ‘iv1’

./sshcrypto.c:165: error: ‘struct des3_state’ has no member named ‘iv2’

./sshcrypto.c:166: error: ‘struct des3_state’ has no member named ‘iv3’

./sshcrypto.c: In function ‘des3_encrypt’:

./sshcrypto.c:176: error: ‘struct des3_state’ has no member named ‘iv1’

./sshcrypto.c:176: error: ‘struct des3_state’ has no member named ‘iv2’

./sshcrypto.c:178: error: ‘struct des3_state’ has no member named ‘k1’

./sshcrypto.c:178: error: ‘struct des3_state’ has no member named ‘iv1’

./sshcrypto.c:178: error: ‘DES_ENCRYPT’ undeclared (first use in this function)

./sshcrypto.c:179: error: ‘struct des3_state’ has no member named ‘k2’

./sshcrypto.c:179: error: ‘struct des3_state’ has no member named ‘iv2’

./sshcrypto.c:179: error: ‘DES_DECRYPT’ undeclared (first use in this function)

./sshcrypto.c:180: error: ‘struct des3_state’ has no member named ‘k3’

./sshcrypto.c:180: error: ‘struct des3_state’ has no member named ‘iv3’

./sshcrypto.c: In function ‘des3_decrypt’:

./sshcrypto.c:189: error: ‘struct des3_state’ has no member named ‘iv1’

./sshcrypto.c:189: error: ‘struct des3_state’ has no member named ‘iv2’

./sshcrypto.c:191: error: ‘struct des3_state’ has no member named ‘k3’

./sshcrypto.c:191: error: ‘struct des3_state’ has no member named ‘iv3’

./sshcrypto.c:191: error: ‘DES_DECRYPT’ undeclared (first use in this function)

./sshcrypto.c:192: error: ‘struct des3_state’ has no member named ‘k2’

./sshcrypto.c:192: error: ‘struct des3_state’ has no member named ‘iv2’

./sshcrypto.c:192: error: ‘DES_ENCRYPT’ undeclared (first use in this function)

./sshcrypto.c:193: error: ‘struct des3_state’ has no member named ‘k1’

./sshcrypto.c:193: error: ‘struct des3_state’ has no member named ‘iv1’

make: * [sshcrypto.o] Error 1 解决方法：**

修改sshcrypto.c，内容如下：

＃include <sys/types.h>

＃include <openssl/ssl.h>

＃include <openssl/blowfish.h> ##需要添加的行

＃include <openssl/des.h> ##需要添加的行

＃include <err.h>

＃include <stdio.h>
问题二：
xwd.c:87:29: 错误： X11/Xmu/WinUtil.h：No such file or directory

make: * [xwd.o] 错误 1 解决方法：**
sudo apt-get install libxmu-dev