source: git/HOWTO-libsingular @ 3857cb

export CC="gcc -fpic -DPIC -DLIBSINGULAR"
export CXX="g++ -fpic -DPIC -DLIBSINGULAR"
./configure
make install-libsingular

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how to compile and run the the example:
g++ -I......include -o tt tt.cc -L..../Singular -lsingular
export LD_LIBRARY_PATH=...../Singular
./tt
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the example:
#include <libsingular.h>
void main()
{
  // init path names etc.
  siInit((char *)"/home/hannes/singular-gap/Singular/p_Procs_FieldZp.so");

  // construct the ring Z/32003[x,y,z]
  // the variable names
  char **n=(char**)omalloc(3*sizeof(char*));
  n[0]=omStrDup("x");
  n[1]=omStrDup("y");
  n[2]=omStrDup("z");

  ring R=rDefault(32003,3,n);
  // make R the default ring:
  rChangeCurrRing(R);

  // create the polynomial 1
  poly p1=p_ISet(1,R);

  // create tthe polynomial 2*x^3*z^2
  poly p2=p_ISet(2,R);
  pSetExp(p2,1,3);
  pSetExp(p2,3,2);
  pSetm(p2);

  // print p1 + p2
  pWrite(p1); printf(" + \n"); pWrite(p2); printf("\n");

  // compute p1+p2
  p1=p_Add_q(p1,p2,R); p2=NULL;
  pWrite(p1); 

  // cleanup:
  pDelete(&p1);
  rKill(R);
}