Index: uspace/Makefile.common
===================================================================
--- uspace/Makefile.common	(revision 5b0cf635022b821f28f7a014ad5b39d005cd7666)
+++ uspace/Makefile.common	(revision 1ab3c4b698c08d84c77675ba474ca8dfd5164dbc)
@@ -175,5 +175,5 @@
 
 COMMON_CFLAGS = $(INCLUDES_FLAGS) -O$(OPTIMIZATION) -imacros $(CONFIG_HEADER) \
-	-ffreestanding -fno-builtin -nostdlib -nostdinc -fexec-charset=UTF-8 \
+	-ffreestanding -nostdlib -nostdinc -fexec-charset=UTF-8 \
 	-finput-charset=UTF-8 -D__$(ENDIANESS)__ -D_HELENOS_SOURCE -fno-common \
 	-fdebug-prefix-map=$(realpath $(ROOT_PATH))=.