C Code NI-VISA linker error

Question

I wrote the following C command to pass SCPI commands to Rohde&Schwarz FSL
#define NIVISA_PXI
#include <visa.h>
#define MAX_CNT 200
int main(void)
ViStatus status; /* For checking errors */
ViSession defaultRM, instr; /* Communication channels */
ViUInt32 retCount; /* Return count from string I/O */
ViChar buffer[MAX_CNT]; /* Buffer for string I/O */
status = viOpenDefaultRM(&defaultRM);
if (status < VI_SUCCESS)
return -1;
status = viWrite(instr, "*RST", 6, &retCount);
status = viClose(instr);
status = viClose(defaultRM);
return 0;
I am getting linker errors.   [Linker error] undefined reference to `viOpenDefaultRM@4' 
I use Bloodshed Dev C++ . I have included the header files from the VXIPNP folder to the include folder od Dev C++. It had 11 files.it had 4 header files visa.h, visatype.h, vpptype.h and rsfsp.h
Do i need to install any header file or libraries? Please help, this is the first time I am using VISA.H 
Solved!
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Answer 1

[root@localhost raavan]# gcc main.c -L /usr/local/lib/libvisa.so
/tmp/ccKHyQta.o: In function `sendscpi':
main.c: (.text+0x2e): undefined reference to `viWrite'
/tmp/ccKHyQta.o: In function `main':
main.c: (.text+0x52): undefined reference to `viOpenDefaultRM'
main.c: (.text+0x99): undefined reference to `viOpen'
main.c: (.text+0xbb): undefined reference to `viSetAttribute'
main.c: (.text+0xd9): undefined reference to `viClose'
main.c: (.text+0xeb): undefined reference to `viClose'
collect2: ld returned 1 exit status
contents of main.c are:
 #include "visa.h"
#include "stdio.h"
#include "string.h"
#define MAX_CNT 200
char scpi[50]; /*To store the SCPI commands*/
ViStatus status; /* For checking errors */
ViSession defaultRM, instr; /* Communication channels */
ViUInt32 retCount; /* Return count from string I/O */
ViChar buffer[MAX_CNT]; /* Buffer for string I/O */
void sendscpi (char *s)  
     status = viWrite(instr, (ViBuf)s, strlen (s), &retCount);
int main(void)
/* Begin by initializing the system*/
status = viOpenDefaultRM(&defaultRM);
if (status < VI_SUCCESS) {
return -1;
/* Open communication with TCPIP Device at Primary Addr FSL (192.168.186.107)*/
status = viOpen(defaultRM, "192.168.186.107", VI_NULL, VI_NULL,&instr);
/* Set the timeout for message-based communication*/
status = viSetAttribute(instr, VI_ATTR_TMO_VALUE, 5000);
/* Send SCPI commands for the test case */
sendscpi ("*RST" ) ;
/* Close down the system */
status = viClose(instr);
status = viClose(defaultRM);
return 0;
Please help!
Message Edited by rohit_rs on 03-12-2009 07:04 AM
Message Edited by rohit_rs on 03-12-2009 07:04 AM