--- epm-4.2.old/epm.c
+++ epm-4.2/epm.c
@@ -60,6 +60,7 @@
 main(int  argc,				/* I - Number of command-line args */
      char *argv[])			/* I - Command-line arguments */
 {
+  int pnc;
   int		i;			/* Looping var */
   int		strip;			/* 1 if we should strip executables */
   struct utsname platform;		/* UNIX name info */
@@ -409,11 +410,14 @@
     usage();
   }
 
-  for (i = 0; prodname[i]; i ++)
-    if (!isalnum(prodname[i] & 255))
+    for (i = 0; (pnc = 0xFF & (int) prodname [i]) != 0; i++)
     {
-      puts("epm: Product names should only contain letters and numbers!");
-      break;
+        if (!isalnum (pnc) &&
+            (pnc != '_') && (pnc != '-') && (pnc != '.'))
+        {
+puts ("epm: Product names should only contain 0-9A-Za-z_-.");
+break;
+        }
     }
 
   if (!listname[0])