Index: uspace/lib/libc/include/ctype.h
===================================================================
--- uspace/lib/libc/include/ctype.h	(revision 7782030a5944566e96b3a1307067dc1993fd1a64)
+++ uspace/lib/libc/include/ctype.h	(revision d2093d6216093b33fd00e516e5a5d3b907687613)
@@ -85,4 +85,12 @@
 }
 
+static inline int toupper(int c)
+{
+	if (islower(c))
+		return (c - ('a' - 'A' > 0 ? 'a' - 'A' : 'A' - 'a'));
+	else
+		return c;
+}
+
 #endif