Index: thermal.h
===================================================================
--- thermal.h	(revision 35677)
+++ thermal.h	(revision 35678)
@@ -61,6 +61,7 @@
    chars2bits() is the inverse transformation; returns 0 on success
 */
 void pcb_thermal_bits2chars(char dst[3], pcb_thermal_t bits);
+const char *pcb_thermal_bits2chars_const(pcb_thermal_t bits);
 int pcb_thermal_chars2bits(pcb_thermal_t *dst, const char *src);