diff --git a/init.cpp b/init.cpp
index 6cbb6a72..27c45637 100644
--- a/init.cpp
+++ b/init.cpp
@@ -157,7 +157,7 @@
 #define PSEUDOKEY_RELEASE 2503
 
 #ifndef CAP_PNG
-#define CAP_PNG (!ISMOBWEB && !ISMAC && CAP_SDLGFX)
+#define CAP_PNG (!ISMOBWEB)
 #endif
 
 #ifndef CAP_COMMANDLINE
diff --git a/rug.cpp b/rug.cpp
index 96913687..045b6eda 100644
--- a/rug.cpp
+++ b/rug.cpp
@@ -751,7 +751,7 @@ void preset(rugpoint *m) {
     
   if(q>0) m->flat = h/q;
   // printf("preset (%d) -> %s\n", q, display(m->flat));
-  if(isnan(m->flat[0]) || isnan(m->flat[1]) || isnan(m->flat[2]))
+  if(std::isnan(m->flat[0]) || std::isnan(m->flat[1]) || std::isnan(m->flat[2]))
     throw rug_exception();
   }
 
@@ -839,7 +839,7 @@ void subdivide() {
       rugpoint *m2 = m->edges[j].target;
       if(m2 < m) continue;
       rugpoint *mm = addRugpoint(mid(m->h, m2->h), (m->dist+m2->dist)/2);
-      halves[{m, m2}] = mm;
+      halves[make_pair(m, m2)] = mm;
       if(!good_shape || (torus && !keep_shape)) {
         using namespace hyperpoint_vec;
         normalizer n(m->flat, m2->flat);
diff --git a/textures.cpp b/textures.cpp
index 90a48ed8..4fab40a0 100644
--- a/textures.cpp
+++ b/textures.cpp
@@ -131,10 +131,13 @@ bool readtexture() {
 
 #elif CAP_PNG
   
-  FILE *f = fopen(texturename.c_str(), "r");  
+  FILE *f = fopen(texturename.c_str(), "rb");
   png_structp png = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
   if(!png) return false;  
-  if(setjmp(png_jmpbuf(png))) return false;  
+  if(setjmp(png_jmpbuf(png))) { 
+    printf("failed to read\n");
+    return false;  
+    }
   png_init_io(png, f);
 
   // set the expected format
@@ -237,17 +240,17 @@ int color_alpha = 128;
 
 int gsplits = 1;
 
-template<class T> array<T, 3> make_array(T a, T b, T c) { array<T,3> x = {a,b,c}; return x; }
-template<class T> array<T, 2> make_array(T a, T b) { array<T,2> x = {a,b}; return x; }
+template<class T> array<T, 3> make_array(T a, T b, T c) { array<T,3> x; x[0] = a; x[1] = b; x[2] = c; return x; }
+template<class T> array<T, 2> make_array(T a, T b) { array<T,2> x; x[0] = a; x[1] = b; return x; }
 
 void mapTextureTriangle(textureinfo &mi, array<hyperpoint, 3> v, int splits = gsplits) {
 
   if(splits) {
-    array<hyperpoint, 3> v2 = { mid(v[1], v[2]), mid(v[2], v[0]), mid(v[0], v[1]) };
+    array<hyperpoint, 3> v2 = make_array( mid(v[1], v[2]), mid(v[2], v[0]), mid(v[0], v[1]) );
     mapTextureTriangle(mi, make_array(v[0], v2[2], v2[1]), splits-1);
     mapTextureTriangle(mi, make_array(v[1], v2[0], v2[2]), splits-1);
     mapTextureTriangle(mi, make_array(v[2], v2[1], v2[0]), splits-1);
-    mapTextureTriangle(mi, make_array(v[1], v2[0], v2[2]), splits-1);
+    mapTextureTriangle(mi, make_array(v2[0], v2[1], v2[2]), splits-1);
     return;
     }
     
@@ -1147,7 +1150,7 @@ void fillcircle(hyperpoint h, int col) {
   
   ld step = M_PI * 2/3;
   
-  array<hyperpoint, 3> mh = {A * xpush(penwidth) * C0, A * spin(step) * xpush(penwidth) * C0, A * spin(-step) * xpush(penwidth) * C0};
+  array<hyperpoint, 3> mh = make_array(A * xpush(penwidth) * C0, A * spin(step) * xpush(penwidth) * C0, A * spin(-step) * xpush(penwidth) * C0);
   auto mp = ptc(mh);
 
   filltriangle(mh, mp, col, 0);