-bool AM, BS, CA, DA, DB, EO, GT, HZ, IN, MI, MS, NC, OS, UL, XN;
-char *AL, *BC, *BT, *CD, *CE, *CL, *CM, *DC, *DL, *DM, *DO, *ED,
- *EI, *HO, *IC, *IM, *IP, *LL, *MA, *ND, *SE, *SF, *SO, *SR,
- *TA, *TE, *TI, *UC, *UE, *UP, *US, *VB, *VE, *VS, PC;
+extern bool AM, BS, CA, DA, DB, EO, GT, HZ, IN, MI, MS, NC, OS, UL,
+ XN;
+extern char *AL, *BC, *BT, *CD, *CE, *CL, *CM, *DC, *DL, *DM, *DO,
+ *ED, *EI, *HO, *IC, *IM, *IP, *LL, *MA, *ND, *SE, *SF,
+ *SO, *SR, *TA, *TE, *TI, *UC, *UE, *UP, *US, *VB, *VE,
+ *VS, PC;