Index: libconfig.c
==================================================================
--- libconfig.c
+++ libconfig.c
@@ -82,10 +82,20 @@
 	dataval = data;
 	*dataval = strtoull(value, NULL, 10);
 
 	return(0);
 }
+
+static int lc_process_var_bool_byexistance(void *data, const char *value) {
+	int *dataval;
+
+	dataval = data;
+
+	*dataval = 1;
+
+	return(0);
+}
 
 static int lc_process_var_bool(void *data, const char *value) {
 	int *dataval;
 
 	dataval = data;
@@ -210,10 +220,13 @@
 			return(lc_process_var_sizeint(data, value));
 			break;
 		case LC_VAR_SIZE_SHORT:
 			return(lc_process_var_sizeshort(data, value));
 			break;
+		case LC_VAR_BOOL_BY_EXISTANCE:
+			return(lc_process_var_bool_byexistance(data, value));
+			break;
 		case LC_VAR_TIME:
 		case LC_VAR_DATE:
 		case LC_VAR_FILENAME:
 		case LC_VAR_DIRECTORY:
 			PRINTERR_D("Not implemented yet!");
@@ -364,11 +377,11 @@
 				/* Ignore this handler if they don't match. */
 				if (strcasecmp(lastcomponent_handler, cmdarg) != 0) {
 					continue;
 				}
 
-				if (handler->type == LC_VAR_NONE) {
+				if (handler->type == LC_VAR_NONE || handler->type == LC_VAR_BOOL_BY_EXISTANCE) {
 					cmdoptarg = NULL;
 				} else {
 					cmdargidx++;
 					if (cmdargidx >= argc) {
 						PRINTERR("Argument required.");
@@ -408,11 +421,11 @@
 					    handler->type == LC_VAR_SECTIONEND ||
 					    handler->type == LC_VAR_UNKNOWN) {
 						continue;
 					}
 
-					if (handler->type == LC_VAR_NONE) {
+					if (handler->type == LC_VAR_NONE || handler->type == LC_VAR_BOOL_BY_EXISTANCE) {
 						cmdoptarg = NULL;
 					} else {
 						cmdargidx++;
 						if (cmdargidx >= argc) {
 							PRINTERR("Argument required.");
@@ -495,10 +508,11 @@
 			}
 		}
 
 		if (value == NULL &&
 		    handler->type != LC_VAR_NONE &&
+		    handler->type != LC_VAR_BOOL_BY_EXISTANCE &&
 		    handler->type != LC_VAR_SECTION &&
 		    handler->type != LC_VAR_SECTIONSTART &&
 		    handler->type != LC_VAR_SECTIONEND) {
 			lc_errno = LC_ERR_BADFORMAT;
 			break;

Index: libconfig.h.in
==================================================================
--- libconfig.h.in
+++ libconfig.h.in
@@ -13,12 +13,12 @@
 } lc_conf_type_t;
 
 __BLANK_LINE__
 
 typedef enum {
-        LC_VAR_UNKNOWN,
-        LC_VAR_NONE,
+        LC_VAR_UNKNOWN,			/* Requires no arguments. */
+        LC_VAR_NONE,			/* Requires no arguments. */
         LC_VAR_STRING,
         LC_VAR_LONG_LONG,
         LC_VAR_LONG,
         LC_VAR_INT,
         LC_VAR_SHORT,
@@ -31,11 +31,12 @@
         LC_VAR_SIZE_SHORT,
         LC_VAR_TIME,
         LC_VAR_DATE,
         LC_VAR_SECTION,
         LC_VAR_SECTIONSTART,
-        LC_VAR_SECTIONEND
+        LC_VAR_SECTIONEND,
+	LC_VAR_BOOL_BY_EXISTANCE	/* Requires no arguments. */
 } lc_var_type_t;
 
 __BLANK_LINE__
 
 typedef enum {

Index: test-lc.c
==================================================================
--- test-lc.c
+++ test-lc.c
@@ -33,17 +33,19 @@
 	char *joeval = NULL;
 	long long xval = -1;
 	int onoff = -1;
 	int lcpret = -1;
 	int i = 0;
+	int onoff2 = 0;
 	lc_err_t errs;
 
 	lc_register_var("Section", LC_VAR_SECTION, NULL, 0);
 	lc_register_var("Somesection", LC_VAR_SECTION, NULL, 0);
 	lc_register_var("Section.Test", LC_VAR_STRING, &joeval, 'j');
 	lc_register_var("bob", LC_VAR_SIZE_LONG_LONG, &xval, 's');
 	lc_register_var("Somesection.Free", LC_VAR_BOOL, &onoff, 0);
+	lc_register_var("long", LC_VAR_BOOL_BY_EXISTANCE, &onoff2, 'l');
 	lc_register_callback("sally", 0, LC_VAR_STRING, sally_cmd, NULL);
 	lc_register_callback("HELP", 'h', LC_VAR_NONE, help_cmd, NULL);
 	lc_register_callback("*.ifmodule", 0, LC_VAR_NONE, cmd_ifmodule, NULL);
 	lcpret = lc_process(argc, argv, "testapp", LC_CONF_APACHE, "test.cfg");
 	if (lcpret < 0) {
@@ -56,11 +58,12 @@
 	} else {
 		PRINTERR("joeval = \"(null)\"");
 	}
 	PRINTERR("xval = %lli", xval);
 	PRINTERR("onoff = %i", onoff);
+	PRINTERR("long = %i", onoff2);
 	for (i = lc_optind; i < argc; i++) {
 		PRINTERR("argv[%i] = \"%s\"", i, argv[i]);
 	}
 
 	return(0);
 }