Tell build systems about utils/attr.h
diff --git a/Makefile.am b/Makefile.am
index 6db071e..16c9bee 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -94,6 +94,7 @@
     src/utils/alloc.c \
     src/utils/atomic.h \
     src/utils/atomic.c \
+    src/utils/attr.h \
     src/utils/chunk.h \
     src/utils/chunk.c \
     src/utils/chunkref.h \
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 6a03544..8db5dad 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -85,6 +85,7 @@
     utils/alloc.c
     utils/atomic.h
     utils/atomic.c
+    utils/attr.h
     utils/chunk.h
     utils/chunk.c
     utils/chunkref.h