diff --git a/qpkg/prereq.c b/qpkg/prereq.c
index 22be23f..1ddc125 100644
--- a/qpkg/prereq.c
+++ b/qpkg/prereq.c
@@ -34,6 +34,7 @@ static struct pkg **installs = NULL;
 static int n_best;	/* undefined if best == NULL */
 static int n_install = 0;
 static int install_max = 0;
+static int debug = 0;
 
 
 static int epoch(const char **s, const struct id *id)
@@ -111,7 +112,6 @@ static void done(void)
 
 static void append_install(struct pkg *pkg)
 {
-//fprintf(stderr, "push %.*s\n", ID2PF(pkg->id));
 	if (n_install == install_max) {
 		install_max = (install_max+1)*2;
 		installs = realloc(installs, sizeof(*installs)*install_max);
@@ -170,7 +170,7 @@ static int conflicts(const struct pkg *pkg, const struct list *conf)
 static void resolve(struct list *next_dep, const struct ref *dep,
     struct list *conf)
 {
-static int level = 0;
+	static int level = 0;
 	struct list more_deps;
 	struct list more_conf = {
 		.next = conf
@@ -188,15 +188,17 @@ static int level = 0;
 	for (pkg = dep->pkg->jrb->val; pkg; pkg = pkg->more) {
 		if (best && n_install == n_best)
 			return;
-#if 0
-fprintf(stderr, "%*s", level, "");
-fprintf(stderr, "%.*s %p", ID2PF(pkg->id), pkg);
-if (pkg->version)
-fprintf(stderr, " %.*s", ID2PF(pkg->version));
-if (pkg->mark) fprintf(stderr, " +");
-if (pkg->flags & QPKG_INSTALLED) fprintf(stderr, " ***");
-fprintf(stderr, "\n");
-#endif
+		if (debug) {
+			fprintf(stderr, "%*s", level, "");
+			fprintf(stderr, "%.*s %p", ID2PF(pkg->id), pkg);
+			if (pkg->version)
+				fprintf(stderr, " %.*s", ID2PF(pkg->version));
+			if (pkg->mark)
+				fprintf(stderr, " +");
+			if (pkg->flags & QPKG_INSTALLED)
+				fprintf(stderr, " ***");
+			fprintf(stderr, "\n");
+		}
 		if (!satisfies(pkg, dep))
 			continue;
 		if ((pkg->flags & QPKG_INSTALLED) || pkg->mark) {
@@ -206,7 +208,7 @@ fprintf(stderr, "\n");
 		}
 		if (conflicts(pkg, conf))
 			continue;
-level++;
+		level++;
 		append_install(pkg);
 		more_deps.refs = pkg->depends;
 		more_deps.next = next_dep;
@@ -215,7 +217,7 @@ level++;
 		resolve(&more_deps, dep->next, &more_conf);
 		next_dep = more_deps.next;
 		backtrack();
-level--;
+		level--;
 	}
 }