diff --git a/src/driver/main.c b/src/driver/main.c
index b1f867c..d645514 100644
--- a/src/driver/main.c
+++ b/src/driver/main.c
@@ -1,11 +1,13 @@
 /**
  * Main C source code file for the JabaCat C Compiler.
- * Initial commit: June 17, 2024
  */
 
 #include <stdio.h>
 
+#include <util/out.h>
+
 int main(int argc, char **argv) {
-    printf("%s\n", "Hello, World!");
+    PRINT_DEFAULT("JabaCat C Compiler 2024");
+    PRINT_DEBUG("Compilation not supported yet -- coming soon!");
     return 0;
 }
diff --git a/src/lexer/lex.c b/src/lexer/lex.c
index 60f5f56..934371e 100644
--- a/src/lexer/lex.c
+++ b/src/lexer/lex.c
@@ -3,6 +3,8 @@
 #include <string.h> // memcpy
 #include <assert.h> // assert
 
+#include <util/out.h> // error reporting
+
 int lex(Lexer *l, Token *t) {
     // If there are any tokens waiting in the putback buffer, read from there
     // instead.
@@ -18,7 +20,10 @@ int lex(Lexer *l, Token *t) {
 int unlex(Lexer *l, Token *t) {
     // First, make sure we can actually fit it in the buffer.
     if (l->unlexed_count >= TOKEN_PUTBACKS) {
-        // TODO: error reporting
+        PRINT_ERROR(
+            "internal: tried to unlex more than %d tokens at a time",
+            TOKEN_PUTBACKS
+        );
         return -1; // Error return code
     }
     memcpy(&l->unlexed[l->unlexed_count], t, sizeof(Token));
diff --git a/src/util/out.h b/src/util/out.h
new file mode 100644
index 0000000..2085864
--- /dev/null
+++ b/src/util/out.h
@@ -0,0 +1,38 @@
+/**
+ * This provides facilities for properly-formatted output. This is just taken
+ * from yfc's output facilities.
+ */
+
+#pragma once
+
+// All of the color codes.
+#define CODE_RED 31
+#define CODE_YELLOW 33
+#define CODE_GREEN 32
+#define CODE_BLUE 34
+#define CODE_MAGENTA 35
+#define CODE_CYAN 36
+#define CODE_WHITE 37
+
+// Print things with colors.
+#define OUTPUT_STREAM stderr
+#define SET_COLOR(color) fprintf(OUTPUT_STREAM, "\033[%dm", color)
+#define RESET_COLOR(color) fprintf(OUTPUT_STREAM, "\033[0m")
+
+#define PRINT_WITH_COLOR(color, ...) do { \
+    SET_COLOR(color); \
+    fprintf(OUTPUT_STREAM, __VA_ARGS__); \
+    RESET_COLOR(color); \
+} while (0)
+
+#define PRINT_ERROR(msg, ...) \
+    PRINT_WITH_COLOR(CODE_RED, "Error: jccc: " msg "\n" ,##__VA_ARGS__)
+
+#define PRINT_WARNING(msg, ...) \
+    PRINT_WITH_COLOR(CODE_YELLOW, "Warning: jccc: " msg "\n" ,##__VA_ARGS__)
+
+#define PRINT_DEBUG(msg, ...) \
+    PRINT_WITH_COLOR(CODE_BLUE, "Debug: jccc: " msg "\n" ,##__VA_ARGS__)
+
+#define PRINT_DEFAULT(msg, ...) \
+    PRINT_WITH_COLOR(CODE_WHITE, "jccc: " msg "\n" ,##__VA_ARGS__)