Index: uspace/lib/libc/Makefile.toolchain
===================================================================
--- uspace/lib/libc/Makefile.toolchain	(revision 54b2e7466e73fdf2325536108c991394e0642b7e)
+++ uspace/lib/libc/Makefile.toolchain	(revision 0175246a19e8ee96e2ea4f2c13e89c437bf42b2e)
@@ -27,5 +27,8 @@
 #
 
-CFLAGS = -fno-builtin -Wall -Werror-implicit-function-declaration -Wmissing-prototypes -O3 -nostdlib -nostdinc -imacros $(LIBC_PREFIX)/../../../config.h -I$(LIBC_PREFIX)/include -pipe -g
+CFLAGS = -fno-builtin -Wall -Werror-implicit-function-declaration\
+    -fexec-charset=UTF-8 -fwide-exec-charset=UTF-32 -finput-charset=UTF-8\
+    -Wmissing-prototypes -O3 -nostdlib -nostdinc -imacros\
+    $(LIBC_PREFIX)/../../../config.h -I$(LIBC_PREFIX)/include -pipe -g
 LFLAGS = -M -N $(SOFTINT_PREFIX)/libsoftint.a
 AFLAGS =