Try using emconfigure again

povray_wasm/compile_povray_wasm.sh

@@ -40,6 +40,7 @@ ARGS=(
 	CFLAGS="$CFLAGS"
 	CXXFLAGS="$CFLAGS"
 	LDFLAGS="$LDFLAGS"
+	--host=wasm32-unknown-emscripten
 )
 
 echo "Prebuilding..."
@@ -51,7 +52,20 @@ cd ../
 
 echo "Configuring..."
 
-BOOST_ROOT=$BOOST_ROOT ./configure "${ARGS[@]}"
+#BOOST_ROOT=$BOOST_ROOT ./configure "${ARGS[@]}"
+
+  emconfigure ./configure \
+    --disable-lib-checks \
+    --disable-optimiz-arch \
+    COMPILED_BY='emscripten' \
+    --without-x \
+    --without-libsdl \
+    --without-libtiff \
+    --without-libjpeg \
+    --without-libpng \
+    --disable-io-restrictions \
+    --disable-shared \
+    --enable-static
 
 #emmake make -j CPPFLAGS="${CPPFLAGS}"
 #make install