我的程序 aa.cpp
B2TxE#nfLinux伊甸园论坛#include<iostream>Linux伊甸园论坛xB.Zz7LG
using namespace std;
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#include<sys/types.h>Linux伊甸园论坛;~w)s-S!O
#include<sys/stat.h>~4L!_hk)W
#include<fcntl.h>xXEE$D5[
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#include<stdlib.h>
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#include<unistd.h>AX6l$x
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#include"snmp_pp/snmp_pp.h"www.linuxeden.comk!}|5t"y-n0x
#define SYSDESCR “1.3.6.1.2.1.1.1.0”
PB2i#Gf!}www.linuxeden.comint main ()6d:V(N:["]Q4eK
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   int status;   
K-cOU"V4H{lwww.linuxeden.com   CTarget ctarget( (IpAddress) “58.192.113.104”);  
0h        M(yKOs(I|   Vb vb( SYSDESCR);   Q9i0`yre+J
  Pdu pdu;
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   if ( status != SNMP_CLASS_SUCCESS) {  
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      return; }
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R%E5KFs{+y/p  pdu += vb;   'X6G.Xw%at(K
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      cout << snmp.error_msg( status);
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      pdu.get_vb( vb,0);  }
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      cout << “System Descriptor = ”<< vb.get_printable_value(); }   
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我的makefile
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USER_INC= -I../include
j%X-_Z-sLinux伊甸园论坛SNMP=-I/usr/local/snmp++/include!fx'F6Al.xw
SNMPLIBS=-L/usr/local/snmp++/lib -lsnmp++8P`,Q)A3m,~E~
aa:aa.o

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jg++ aa.o $(SNMPLIBS) -o aawww.linuxeden.com@
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aa.o:aa.cppH)Km6eUq?
  g++ -c $(USER_INC) aa.cpp $(SNMP)
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clean:
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DlJ8F,K5Gwww.linuxeden.comrm -f aa aa.o\p%`7V.`[
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Zwww.linuxeden.com编译结果
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g++ aa.o -L/usr/local/snmp++/lib -lsnmp++ -o aawww.linuxeden.comGv'IP p
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/usr/local/snmp++/lib/libsnmp++.so: undefined reference to `pthread_create'
2~#KsTJ)d?/usr/local/snmp++/lib/libsnmp++.so: undefined reference to `SHA1_Init'
XN7i6D-}z7E/usr/local/snmp++/lib/libsnmp++.so: undefined reference to `AES_set_encrypt_key'/usr/local/snmp++/lib/libsnmp++.so: undefined reference to `SHA1_Update'

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Fwww.linuxeden.com/usr/local/snmp++/lib/libsnmp++.so: undefined reference to `SHA1_Final'LxQQ8AD        Y
/usr/local/snmp++/lib/libsnmp++.so: undefined reference to `MD5_Init'
v5f6Ge1g7eW4S9q/usr/local/snmp++/lib/libsnmp++.so: undefined reference to `MD5_Final'
:t,tb`,CrLinux伊甸园论坛/usr/local/snmp++/lib/libsnmp++.so: undefined reference to `DES_ncbc_encrypt'
lL%@7],Pr~wXwww.linuxeden.com/usr/local/snmp++/lib/libsnmp++.so: undefined reference to `DES_key_sched'P&X
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/usr/local/snmp++/lib/libsnmp++.so: undefined reference to `pthread_join'vVy3_I        L1^`
/usr/local/snmp++/lib/libsnmp++.so: undefined reference to `MD5_Update'
2_M6WNPL/usr/local/snmp++/lib/libsnmp++.so: undefined reference to `AES_cfb128_encrypt'9j
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collect2: ld returned 1 exit status:v5zi2B"^$`
make: *** [aa] Error 1
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我没有用到例如线程之类的库，为什么也要连接这类库函数阿

不巧的是/usr/local/snmp++/lib/libsnmp++.so这个用到了，而貌似你的开发环境没有pthread这些库支持？

哦 原来是这样啊 谢谢指教