Needs not to be gcc - a C compiler is fine.

src/mtime_iso8601.c

@@ -8,7 +8,7 @@
  * @date March 2013
  *
  * @note USAGE: Compile this rl file and generate iso8601.c file. 
-	  Compile the iso8601.c file using gcc. iso8601.h file needs to be edited seperately. 
+	  Compile the iso8601.c file using a C compiler. iso8601.h file needs to be edited seperately. 
           match_found = 1 => DATE/DATETIME. match_found = 2 => Duration. Else non-compliant string and hence REJECT.
 	  Due to application requirements, current implementation allows year in the range 2147483647 and -2147483648 only!
  */

src/mtime_iso8601.rl

@@ -6,7 +6,7 @@
  * @date March 2013
  *
  * @note USAGE: Compile this rl file and generate iso8601.c file. 
-	  Compile the iso8601.c file using gcc. iso8601.h file needs to be edited seperately. 
+	  Compile the iso8601.c file using a C compiler. iso8601.h file needs to be edited seperately. 
           match_found = 1 => DATE/DATETIME. match_found = 2 => Duration. Else non-compliant string and hence REJECT.
 	  Due to application requirements, current implementation allows year in the range 2147483647 and -2147483648 only!
  */