diff --git a/README.md b/README.md
index a7630b41..3510dfe4 100644
--- a/README.md
+++ b/README.md
@@ -309,6 +309,17 @@ and perhaps
 
     make install
 
+Tippecanoe now requires features from the 2014 C++ standard. If your compiler is older than
+that, you will need to install a newer one. On MacOS, updating to the lastest XCode should
+get you a new enough version of `clang++`. On Linux, you should be able to upgrade `g++` with
+
+```
+sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test
+sudo apt-get update -y
+sudo apt-get install -y g++-5
+export CXX=g++-5
+```
+
 Examples
 ------
 
diff --git a/geojson.cpp b/geojson.cpp
index 2e6a83b1..005c4f2c 100644
--- a/geojson.cpp
+++ b/geojson.cpp
@@ -155,17 +155,32 @@ int serialize_geometry(json_object *geometry, json_object *properties, json_obje
 				id_value = strtoull(id->string, &err, 10);
 
 				if (err != NULL && *err != '\0') {
-					fprintf(stderr, "Warning: Can't represent non-integer feature ID %s\n", id->string);
+					static bool warned_frac = false;
+
+					if (!warned_frac) {
+						fprintf(stderr, "Warning: Can't represent non-integer feature ID %s\n", id->string);
+						warned_frac = true;
+					}
 				} else {
 					has_id = true;
 				}
 			} else {
-				fprintf(stderr, "Warning: Can't represent negative feature ID %s\n", id->string);
+				static bool warned_neg = false;
+
+				if (!warned_neg) {
+					fprintf(stderr, "Warning: Can't represent negative feature ID %s\n", id->string);
+					warned_neg = true;
+				}
 			}
 		} else {
-			char *s = json_stringify(id);
-			fprintf(stderr, "Warning: Can't represent non-numeric feature ID %s\n", s);
-			free(s);  // stringify
+			static bool warned_nan = false;
+
+			if (!warned_nan) {
+				char *s = json_stringify(id);
+				fprintf(stderr, "Warning: Can't represent non-numeric feature ID %s\n", s);
+				free(s);  // stringify
+				warned_nan = true;
+			}
 		}
 	}
 
diff --git a/man/tippecanoe.1 b/man/tippecanoe.1
index 08f07c81..664d2aea 100644
--- a/man/tippecanoe.1
+++ b/man/tippecanoe.1
@@ -369,6 +369,19 @@ and perhaps
 make install
 .fi
 .RE
+.PP
+Tippecanoe now requires features from the 2014 C++ standard. If your compiler is older than
+that, you will need to install a newer one. On MacOS, updating to the lastest XCode should
+get you a new enough version of \fB\fCclang++\fR\&. On Linux, you should be able to upgrade \fB\fCg++\fR with
+.PP
+.RS
+.nf
+sudo add\-apt\-repository \-y ppa:ubuntu\-toolchain\-r/test
+sudo apt\-get update \-y
+sudo apt\-get install \-y g++\-5
+export CXX=g++\-5
+.fi
+.RE
 .SH Examples
 .PP
 Check out some examples of maps made with tippecanoe \[la]MADE_WITH.md\[ra]