From: Sergey Organov &lt;sorganov(a)gmail.com&gt; For me it was enabling of UCLIBC_SUSV3_LEGACY=y that broke compilation in separate directory. --- libc/sysdeps/linux/Makefile.commonarch | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/libc/sysdeps/linux/Makefile.commonarch b/libc/sysdeps/linux/Makefile.commonarch index f8dc17d..88309e4 100644 --- a/libc/sysdeps/linux/Makefile.commonarch +++ b/libc/sysdeps/linux/Makefile.commonarch @@ -47,7 +47,7 @@ HEADERCLEAN_$(subst $(top_builddir),,$(ARCH_OUT)): endif $(ARCH_OUT)/ucontext_i.h: $(top_srcdir)extra/scripts/gen-as-const.awk -$(ARCH_OUT)/ucontext_i.h: $(ARCH_OUT)/ucontext_i.sym +$(ARCH_OUT)/ucontext_i.h: $(ARCH_DIR)/ucontext_i.sym @$(disp_gen) $(do_awk) $(top_srcdir)extra/scripts/gen-as-const.awk $< \ | $(CC) $(CFLAGS) -x c - -S -o - \ -- 2.10.0.1.g57b01a3