[igraph] C igraph compilation problem on Lion

[Wu Degang]

Hi,

Recently I installed igraph library on Lion through macport. I just 
copied the example C program code from the manual and tried to compile 
it. The program code is:

#include <igraph.h>
int main(void)
{
    igraph_real_t diameter;
    igraph_t graph;
    igraph_erdos_renyi_game(&graph, IGRAPH_ERDOS_RENYI_GNP, 1000, 5.0/1000,
            IGRAPH_UNDIRECTED, IGRAPH_NO_LOOPS);
    igraph_diameter(&graph, &diameter, 0, 0, 0, IGRAPH_UNDIRECTED, 1);
    printf("Diameter of a random graph with average degree 5: %f\n",
            (double) diameter);
    igraph_destroy(&graph);
    return 0;
}


The compilation was done on Eclipse. The following is the error message 
from Eclipse:
make all
Building file: ../src/test2.c
Invoking: GCC C Compiler
gcc -I/opt/local/include/igraph -O0 -g3 -Wall -c -fmessage-length=0 -MMD 
-MP -MF"src/test2.d" -MT"src/test2.d" -o "src/test2.o" "../src/test2.c"
Finished building: ../src/test2.c

Building target: test2
Invoking: GCC C Linker
gcc -L/opt/local/lib -o "test2"  ./src/test2.o   
-l/opt/local/lib/libigraph.a
ld: library not found for -l/opt/local/lib/libigraph.a
collect2: ld returned 1 exit status
make: *** [test2] Error 1

This is really puzzling because I am sure the library path is correct.

cheers,
wu