diff --git a/tools/build/Makefile b/tools/build/Makefile
--- a/tools/build/Makefile
+++ b/tools/build/Makefile
@@ -68,7 +68,11 @@
 SRCS+=		reallocarray.c
 .endif
 
+.if exists(${HOST_INCLUDE_ROOT}/sys/stat.h)
 _WITH_UTIMENS!= grep -c utimensat ${HOST_INCLUDE_ROOT}/sys/stat.h || true
+.else
+_WITH_UTIMENS= 0
+.endif
 .if ${_WITH_UTIMENS} == 0
 SYSINCS+=	stat.h
 SRCS+=		futimens.c utimensat.c