Index: uspace/lib/c/Makefile
===================================================================
--- uspace/lib/c/Makefile	(revision 58e7b26977afda549d7da683201907528ba22fd9)
+++ uspace/lib/c/Makefile	(revision 954c0240b720c64358bccbdcdcb035fdd5a6f347)
@@ -34,4 +34,5 @@
 
 EXTRA_OUTPUT = $(START_FILES)
+EXTRA_CFLAGS += -fno-builtin
 LIBRARY = libc
 SOVERSION = 0.0