ADDED   aoc2015.c
Index: aoc2015.c
==================================================================
--- /dev/null
+++ aoc2015.c
@@ -0,0 +1,12 @@
+#include <stdio.h>
+
+void aoc201501(char *data, size_t len) {
+    (void)len; // unused argument
+    int floor = 0;
+    while (*data) {
+        if (*data == '(') floor++;
+        else if (*data == ')') floor--;
+        data++;
+    }
+    printf("Santa is taken to floor {%d}.\n", floor);
+}

Index: aocdailies.c
==================================================================
--- aocdailies.c
+++ aocdailies.c
@@ -34,11 +34,11 @@
         case 201506: p = aoc201506; break;
         case 201505: p = aoc201505; break;
         case 201504: p = aoc201504; break;
         case 201503: p = aoc201503; break;
         case 201502: p = aoc201502; break;
-        case 201501: p = aoc201501; break;
         #endif
+        case 201501: p = aoc201501; break;
 
     }
     return p;
 }

Index: aocdailies.h
==================================================================
--- aocdailies.h
+++ aocdailies.h
@@ -34,9 +34,9 @@
 aocfunc aoc201506;
 aocfunc aoc201505;
 aocfunc aoc201504;
 aocfunc aoc201503;
 aocfunc aoc201502;
-aocfunc aoc201501;
 #endif
+aocfunc aoc201501;
 
 #endif