net snmp Compilation problem

Hello Sir,
  I am Shekar from india,
  I want to load net snmp to my system which runs linux 7.3. I downloaded the software in windows, used winzip to unzip the sourcecode, then copied all the files to linux. where I executed the command "configure" as follows, I got following errors. so help me by giving solutions to this problem .
  Here is output of configure command.
   
  CASE1.
   
  [root@localhost net-snmp-5.2.2]# sh ./configure
: command not found
./configure: line 22: syntax error near unexpected token `elif'
./configure: line 22: `elif test -n "${BASH_VERSION+set}" && (set -o posix) >/de'/null 2>&1; then
   
  CASE2:
[root@localhost net-snmp-5.2.2]# ./configure
: bad interpreter: No such file or directory
  
[root@localhost net-snmp-5.2.2]# env CPPFLAGS=-I/usr/local/include LDFLAGS=-s ./configure
env: ./configure: No such file or directory
   
  CASE3:
[root@localhost net-snmp-5.2.2]# sh ./configure --x-include=/usr/X11R6/include --x-libraries=/usr/X11R6/lib
: command not found
./configure: line 22: syntax error near unexpected token `elif'
./configure: line 22: `elif test -n "${BASH_VERSION+set}" && (set -o posix) >/de'/null 2>&1; then
  CASE4:
[root@localhost net-snmp-5.2.2]# ./configure
: bad interpreter: No such file or directory
[root@localhost net-snmp-5.2.2]#
   
   
   
  thanks 
  v.shekar

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