g++ not finds the lib

[FiloSottile]

I am trying to compile a simple c++ pcap program.
I installed pcap using sources->./configure->make->make install
Here is the code and the linking (not compiling) error:

filosottile.at.filosottile-desktop:~/Filo-CM$ cat monitor.cpp
#include <stdio.h>
#include <pcap.h>

int main(int argc, char *argv[])
{
	char *dev, errbuf[PCAP_ERRBUF_SIZE];

	dev = pcap_lookupdev(errbuf);
	if (dev == NULL) {
		fprintf(stderr, "Couldn't find default device: %s\n", errbuf);
		return(2);
	}
	printf("Device: %s\n", dev);
	return(0);
}

filosottile.at.filosottile-desktop:~/Filo-CM$ ls /usr/local/lib
libpcap.a  python2.6  site_ruby
filosottile.at.filosottile-desktop:~/Filo-CM$ g++ -L/usr/local/lib monitor.cpp -llibpcap
/usr/bin/ld: cannot find -llibpcap
collect2: ld returned 1 exit status

Can someone help me, please?

[Rubberman]

Because you installed it in /usr/local you need to add /usr/local/lib to your LD_LIBRARY_PATH environment variable. From your command line where you are running the executable:

export LD_LIBRARY_PATH=${LD_LIBRARY_PATH}:/usr/local/lib

You can add that to your ~/.bash_profile so it will be set for all your applications the next time you login.

[FiloSottile]

But why "-L/usr/local/lib" didn't work?

[Rubberman]

But why "-L/usr/local/lib" didn't work?

Sorry. Didn't read your posting closely enough. Your problem is with linking. You are using -llibpcap. Change that to -lpcap - you don't use the leading 'lib' with Linux/Unix compilers.