GAP 4.8.9 installation with standard packages -- copy to your CoCalc project to get it

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#include"typedef.h"
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#include"getput.h"
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#include"bravais.h"
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#include"matrix.h"
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main (int argc, char *argv[])
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{
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  int anz,
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      anz2,
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      i;
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  char comment[1000];
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  matrix_TYP **Formen,
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             **A,
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              *tmp;
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  read_header(argc, argv);
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  if(FILEANZ < 2 || is_option('h'))
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  {
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    printf("Usage: Normlin file1 file2\n");
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    printf("\n");
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    printf("where file1 and file2 contain a matrix_TYP.\n");
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    printf("\n");
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    printf("Calculates for each matrix A in 'file2' a matrix X with the\n");
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    printf("property that\n");
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    printf(" \\sum_j X_{i,j} F_j = A^{tr} F_j A with F_j in 'file1'\n");
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    printf("\n");
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    printf("CAUTION: The matrix describes the action on rows!\n");
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    printf("\n");
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    if (is_option('h')){
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       exit(0);
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    }
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    else{
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       exit(31);
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    }
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  }
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  Formen = mget_mat(FILENAMES[0],&anz);
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  A = mget_mat(FILENAMES[1],&anz2);
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  for (i=0;i<anz2;i++){
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     tmp = normlin(Formen,A[i],anz);
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     sprintf(comment,"Normalin for %d-th matrix of %s on the formspace %s",
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                      i+1,FILENAMES[1],FILENAMES[2]);
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     Check_mat(tmp);
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     put_mat(tmp,NULL,comment,2);
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     free_mat(tmp);
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  }
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  exit(0);
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}
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