diff --git a/phreeqcpp/cvode.cpp b/phreeqcpp/cvode.cpp
index e3331bc7..b6193ce2 100644
--- a/phreeqcpp/cvode.cpp
+++ b/phreeqcpp/cvode.cpp
@@ -3591,7 +3591,7 @@ CVsldet(CVodeMem cv_mem)
 	realtype /*small_cvode,*/ tem, sqmax, saqk, qp, s, sqmaxk, saqj, sqmin;
 	realtype rsa, rsb, rsc, rsd, rse, rd1a, rd1b, rd1c, rd1d;
 	//realtype rd2a, rd2b, rd2c, rd3a, rd3b, cest1, corr1;
-	realtype rd2a, rd2b, rd2c, rd3a, cest1, corr1;
+	realtype rd2a, rd2b, rd3a, cest1, corr1;
 	realtype ratp, ratm, qfac1, qfac2, bb, rrb;
 
 	/* The following are cutoffs and tolerances used by this routine */
@@ -3853,7 +3853,7 @@ CVsldet(CVodeMem cv_mem)
 		rd1d = rsd - rse;
 		rd2a = rd1a - rd1b;
 		rd2b = rd1b - rd1c;
-		rd2c = rd1c - rd1d;
+		//rd2c = rd1c - rd1d;
 		rd3a = rd2a - rd2b;
 		//rd3b = rd2b - rd2c;
 		/* rd3b = rd3b; */
diff --git a/phreeqcpp/model.cpp b/phreeqcpp/model.cpp
index ad102955..1b8c2e46 100644
--- a/phreeqcpp/model.cpp
+++ b/phreeqcpp/model.cpp
@@ -3023,7 +3023,7 @@ ss_binary(cxxSS *ss_ptr)
 {
 	LDBLE nb, nc, n_tot, xb, xc, dnb, dnc, l_a0, l_a1;
 	//LDBLE xb2, xb3, xb4, xc2, xc3;
-	LDBLE xb2, xb3, xc2;
+	LDBLE xb2, xc2;
 	LDBLE xb1, xc1;
 /*
  * component 0 is major component
@@ -3112,7 +3112,7 @@ ss_binary(cxxSS *ss_ptr)
 		xc2 = xc * xc;
 		//xc3 = xc2 * xc;
 		xb2 = xb * xb;
-		xb3 = xb2 * xb;
+		//xb3 = xb2 * xb;
 		//xb4 = xb3 * xb;
 		/* xb4 = xb4; */
 		/* xc3 = xc3; */
diff --git a/phreeqcpp/transport.cpp b/phreeqcpp/transport.cpp
index ab6beb50..c4a81114 100644
--- a/phreeqcpp/transport.cpp
+++ b/phreeqcpp/transport.cpp
@@ -2190,11 +2190,12 @@ diffuse_implicit(LDBLE DDt, int stagnant)
 	// ifirst = (bcon_first == 2 ? 1 : 0); ilast = (bcon_last == 2 ? count_cells - 1 : count_cells);
 	int ifirst, ilast;
 	int i_1, i0, i1, i2 = 0;
-	double mfr, mfr1, max_b = 0, b, grad, dVc, j_0e, min_dif_M = pow(10, min_dif_LM);
+	//double mfr, mfr1, max_b = 0, b, grad, dVc, j_0e, min_dif_M = pow(10, min_dif_LM);
+	double mfr, mfr1, b, grad, dVc, j_0e, min_dif_M = pow(10, min_dif_LM);
 	LDBLE dum1, dum2, dum_stag = 0.0, min_mol;
 
 	LDBLE dum = 0;
-	cxxSurfaceCharge * charge_ptr = NULL;
+	//cxxSurfaceCharge * charge_ptr = NULL;
 	if (stagnant > 1)
 		stagnant = 0;
 	cxxSolution *sptr1, *sptr2, *sptr_stag;