Index: uspace/lib/libc/Makefile.toolchain
===================================================================
--- uspace/lib/libc/Makefile.toolchain	(revision 3bf907ab10516755767898b1ff0d5485f3c73729)
+++ uspace/lib/libc/Makefile.toolchain	(revision d4b9d283838f6d0d3ba3423280080aa581136432)
@@ -28,7 +28,8 @@
 
 CFLAGS = -I$(LIBC_PREFIX)/include -O3 -imacros $(LIBC_PREFIX)/../../../config.h \
-	-fexec-charset=UTF-8 -fwide-exec-charset=UTF-32 -finput-charset=UTF-8 \
-	-fno-builtin -Wall -Wextra -Wno-unused-parameter -Wmissing-prototypes \
-	-Werror-implicit-function-declaration -nostdlib -nostdinc -pipe -g
+	-fexec-charset=UTF-8 -fwide-exec-charset=UTF-32$(ENDIANESS) \
+	-finput-charset=UTF-8 -fno-builtin -Wall -Wextra -Wno-unused-parameter \
+	-Wmissing-prototypes -Werror-implicit-function-declaration -nostdlib \
+	-nostdinc -pipe -g -D__$(ENDIANESS)__
 LFLAGS = -M -N $(SOFTINT_PREFIX)/libsoftint.a
 AFLAGS =