Go for gcc-11.2

Makefile

 SRC_EXT = cc
 
 # Compiler choice
-CXX = g++
+CXX = g++-11.2
 CXXFLAGS = -fopenmp
 LDFLAGS = -O3 -w -fopenmp
 # Compilation command

src/EXECS/LiebLin_Data_Daemon_Nscaling.cc

 
     while (Secs_left > 0) {
 
+      cout << "StartTime = " << StartTime << endl;
+      cout << "ActualTime = " << ActualTime << endl;
+      cout << "Secs_left = " << Secs_left << endl;
+
       iN += 1;
       int N = Nstep * iN;
       DP L = N;

src/EXECS/LiebLin_Fourier_to_x_t_from_RAW.cc

 
     RecMat<complex<DP> > FT(0.0, Npts_x, Npts_t);
     DP twopioverL = twoPI/L;
-
+    DP FFsq;
+    complex<DP> exp_ik, exp_miomega;
     while (RAW_infile.peek() != EOF) {
       RAW_infile >> omega >> iK >> FF >> dev >> label;
+      FFsq = FF * FF;
+      exp_ik = exp(II * (iK * twopioverL));
+      exp_miomega = exp(-II * omega);
       for (int ix = 0; ix < Npts_x; ++ix)
 	for (int it = 0; it < Npts_t; ++it)
-	  FT[ix][it] += FF * FF * exp(II * (iK * twopioverL * xlattice[ix] - omega * tlattice[it]));
+	  //FT[ix][it] += FF * FF * exp(II * (iK * twopioverL * xlattice[ix] - omega * tlattice[it]));
+	  FT[ix][it] = FFsq * pow(exp_ik, xlattice[ix]) * pow(exp_miomega, tlattice[it]);
     }
     RAW_infile.close();