--- gcc-4.6.3/gcc/config/linux.h.bak
+++ gcc-4.6.3/gcc/config/linux.h
@@ -102,3 +102,18 @@
 
 /* Whether we have sincos that follows the GNU extension.  */
 #define TARGET_HAS_SINCOS (OPTION_GLIBC || OPTION_BIONIC)
+
+#if DEFAULT_LIBC == LIBC_MUSL
+#undef INCLUDE_DEFAULTS
+#define INCLUDE_DEFAULTS			\
+  {						\
+    { GPLUSPLUS_INCLUDE_DIR, "G++", 1, 1, 0, 0 }, \
+    { GPLUSPLUS_TOOL_INCLUDE_DIR, "G++", 1, 1, 0, 1 }, \
+    { GPLUSPLUS_BACKWARD_INCLUDE_DIR, "G++", 1, 1, 0, 0 }, \
+    { LOCAL_INCLUDE_DIR, 0, 0, 1, 1, 0 },	\
+    { PREFIX_INCLUDE_DIR, 0, 0, 1, 0, 0 },	\
+    { STANDARD_INCLUDE_DIR, 0, 0, 1, 1, 0 },	\
+    { GCC_INCLUDE_DIR, "GCC", 0, 1, 0, 0 },	\
+    { 0, 0, 0, 0, 0, 0 }			\
+  }
+#endif