Index: uspace/lib/c/Makefile
===================================================================
--- uspace/lib/c/Makefile	(revision 58e7b26977afda549d7da683201907528ba22fd9)
+++ uspace/lib/c/Makefile	(revision 848740c9426c4efa097f990344c896405c19c59d)
@@ -34,4 +34,5 @@
 
 EXTRA_OUTPUT = $(START_FILES)
+EXTRA_CFLAGS += -fno-builtin
 LIBRARY = libc
 SOVERSION = 0.0