Hi, I am exploring the use of Wt library to have a Web interface to gretl API (libgretl). This must be done in C++, and there are some difficulties in using libgretl. I have done the recommendation in this post (http://lists.wfu.edu/pipermail/gretl-users/2010-June/005026.html), to add a compiler directive to libgretl.h. There was also the need to change the name of a argument in a function declaration because it is a reserved word in C++ (template). These are the changes that need to be done in: include/gretl/libgretl.h +20,22 #ifdef __cplusplus extern "C" { #endif +397,399 #ifdef __cplusplus } /* closing brace for extern "C" */ #endif and in include/gretl/gretl_path.h changed at line 94 (inserted _ at *template) FILE *gretl_mktemp (char *_template, const char *mode); With this changes (that I hope that professor Allin commit them to CVS), I successfully compiled and ran the example program (z.cpp): #include <cstdio> #include <iostream> extern "C" { #include <gretl/libgretl.h> } using namespace std; int main (int argc, char **argv) { cout << "Using libgretl from a C++ program:" << endl; char *fname; DATASET *dset; PRN *prn; int err; if (argc >= 2) { fname = argv[1]; } else { exit(EXIT_FAILURE); } libgretl_init(); prn = gretl_print_new(GRETL_PRINT_STDOUT, NULL); dset = datainfo_new(); err = gretl_read_native_data(fname, dset); if (err) { pprintf(prn, "Got error %d reading data from %s\n", err, fname); errmsg(err, prn); } else { pprintf(prn, "Read data from %s OK\n", fname); print_smpl(dset, 0, prn); varlist(dset, prn); } destroy_dataset(dset); gretl_print_destroy(prn); libgretl_cleanup(); return 0; } Program was compiled with: g++ -o z -Wall -I ./include/ -L ./lib/ z.cpp -lgretl-1.0 -lstdc++ Program takes a data file as argument, for example: ./z gretl/share/data/data10-1.gdt Ouput is: Using libgretl from a C++ program: Read data from gretl/share/data/data10-1.gdt OK Full data range: 1964:1 - 1991:2 (n = 110) Listing 5 variables: 0) const 1) period 2) r 3) M 4) D This info could be added to gretl API documentation, as an example to use from C++. Best Regards, Hélio