--- plot2d/plot.cc.orig	2018-08-29 20:07:27.086257553 -0600
+++ plot2d/plot.cc	2018-08-29 20:08:10.014211101 -0600
@@ -134,7 +134,7 @@ void* readdata(void *x)
 	pthread_mutex_lock(&M);
 	swap(CE,E);
 	pthread_mutex_unlock(&M);
-	for(int i = 0; i < E.size(); i++) delete E[i];
+	for(size_t i = 0; i < E.size(); i++) delete E[i];
 	E.clear(); }
       else if (c == 'E') { /******* Exit! *******************/
 	return 0;
@@ -155,7 +155,7 @@ void display()
 {
   pthread_mutex_lock(&M);
   glClear(GL_COLOR_BUFFER_BIT);
-  for(int i = 0; i < CE.size(); i++)
+  for(size_t i = 0; i < CE.size(); i++)
     CE[i]->glRend(Colors);
   pthread_mutex_unlock(&M);  
   glutSwapBuffers();
@@ -286,7 +286,7 @@ void SNoverSR::glRend(const CADColors &C
   // 128 or so points that can appear.
   C.glSetColor(colorType,'D');
   glBegin(GL_LINE_STRIP);
-  for(int i = 0; i < V.size(); i++)
+  for(size_t i = 0; i < V.size(); i++)
     glVertex2(V[i]);
   glEnd();
 }
@@ -328,7 +328,7 @@ bool SRoverSR::read(istream &in)
     else 
     {
       cerr << "Sector over sector in unknown format!" << endl;
-      for(int i = 0; i < V.size(); i++)
+      for(size_t i = 0; i < V.size(); i++)
 	cerr << V[i] << endl;
       exit(1);
     }
--- source/db/SINGULAR.c.orig	2018-08-29 20:07:50.511232206 -0600
+++ source/db/SINGULAR.c	2018-08-29 20:08:10.015211100 -0600
@@ -67,7 +67,7 @@ Word readSingularPoly(Word r, Word V, is
   Word A, t;
   string s;
   in >> s;
-  for(int i = 0; i < s.length(); ++i)
+  for(size_t i = 0; i < s.length(); ++i)
     if (s[i] == '*') s[i] = ' ';
   s += ".\n";
   istringstream si(s);
@@ -108,7 +108,7 @@ string WritePolyForSingular(Word r, Word
     out = sout.str();
   }
   // Put in * symbols
-  for(int i = 1; i < out.length() - 1; ++i)
+  for(size_t i = 1; i < out.length() - 1U; ++i)
     if (out[i] == ' ' && out[i+1] != '+' && out[i+1] != '-'
 	&& out[i-1] != '+' && out[i-1] != '-'
 	)
--- source/saclib/gcword.c.orig	2018-01-25 14:25:22.000000000 -0700
+++ source/saclib/gcword.c	2018-08-29 20:08:10.015211100 -0600
@@ -30,7 +30,7 @@ void gcw_MARK();
 }
 
 static vector<Word*> G;
-static int lim = 10;
+static size_t lim = 10;
 
 void clean()
 {
@@ -62,7 +62,7 @@ void gcw_MARK()
 {
   //  SWRITE("gcw size is: ");IWRITE(G.size()); SWRITE("\n");
   clean();
-  for(int i = 0; i < G.size(); i++)
+  for(size_t i = 0; i < G.size(); i++)
     if (*G[i] > BETA && *G[i] < BETAp && (*G[i] & 1))
       MARK(*G[i]);