diff --git a/src/hb-aat-layout-common.hh b/src/hb-aat-layout-common.hh
index c0b0e3751..588dbdf2a 100644
--- a/src/hb-aat-layout-common.hh
+++ b/src/hb-aat-layout-common.hh
@@ -675,7 +675,7 @@ struct ClassTable
 
 struct ObsoleteTypes
 {
-  static const bool extended = false;
+  enum { extended = false };
   typedef HBUINT16 HBUINT;
   typedef HBUINT8 HBUSHORT;
   typedef ClassTable<HBUINT8> ClassTypeNarrow;
@@ -705,7 +705,7 @@ struct ObsoleteTypes
 };
 struct ExtendedTypes
 {
-  static const bool extended = true;
+  enum { extended = true };
   typedef HBUINT32 HBUINT;
   typedef HBUINT16 HBUSHORT;
   typedef Lookup<HBUINT16> ClassTypeNarrow;
diff --git a/src/hb-aat-layout-kerx-table.hh b/src/hb-aat-layout-kerx-table.hh
index 7caf45d5d..d0b44609c 100644
--- a/src/hb-aat-layout-kerx-table.hh
+++ b/src/hb-aat-layout-kerx-table.hh
@@ -211,7 +211,7 @@ struct KerxSubTableFormat1
 
   struct driver_context_t
   {
-    static const bool in_place = true;
+    enum { in_place = true };
     enum
     {
       DontAdvance	= Format1EntryT::DontAdvance,
@@ -472,7 +472,7 @@ struct KerxSubTableFormat4
 
   struct driver_context_t
   {
-    static const bool in_place = true;
+    enum { in_place = true };
     enum Flags
     {
       Mark		= 0x8000,	/* If set, remember this glyph as the marked glyph. */
diff --git a/src/hb-aat-layout-morx-table.hh b/src/hb-aat-layout-morx-table.hh
index 171ee4a10..e8a0cdfc9 100644
--- a/src/hb-aat-layout-morx-table.hh
+++ b/src/hb-aat-layout-morx-table.hh
@@ -54,7 +54,7 @@ struct RearrangementSubtable
 
   struct driver_context_t
   {
-    static const bool in_place = true;
+    enum { in_place = true };
     enum Flags
     {
       MarkFirst		= 0x8000,	/* If set, make the current glyph the first
@@ -204,7 +204,7 @@ struct ContextualSubtable
 
   struct driver_context_t
   {
-    static const bool in_place = true;
+    enum { in_place = true };
     enum Flags
     {
       SetMark		= 0x8000,	/* If set, make the current glyph the marked glyph. */
@@ -424,7 +424,7 @@ struct LigatureSubtable
 
   struct driver_context_t
   {
-    static const bool in_place = false;
+    enum { in_place = false };
     enum
     {
       DontAdvance	= LigatureEntryT::DontAdvance,
@@ -660,7 +660,7 @@ struct InsertionSubtable
 
   struct driver_context_t
   {
-    static const bool in_place = false;
+    enum { in_place = false };
     enum Flags
     {
       SetMark		= 0x8000,	/* If set, mark the current glyph. */
diff --git a/src/hb-dsalgs.hh b/src/hb-dsalgs.hh
index 577359601..4a8144ba7 100644
--- a/src/hb-dsalgs.hh
+++ b/src/hb-dsalgs.hh
@@ -735,26 +735,26 @@ inline hb_sorted_array_t<T> hb_sorted_array (T *array, unsigned int len)
 
 struct HbOpOr
 {
-  static const bool passthru_left = true;
-  static const bool passthru_right = true;
+  enum { passthru_left = true };
+  enum { passthru_right = true };
   template <typename T> static void process (T &o, const T &a, const T &b) { o = a | b; }
 };
 struct HbOpAnd
 {
-  static const bool passthru_left = false;
-  static const bool passthru_right = false;
+  enum { passthru_left = false };
+  enum { passthru_right = false };
   template <typename T> static void process (T &o, const T &a, const T &b) { o = a & b; }
 };
 struct HbOpMinus
 {
-  static const bool passthru_left = true;
-  static const bool passthru_right = false;
+  enum { passthru_left = true };
+  enum { passthru_right = false };
   template <typename T> static void process (T &o, const T &a, const T &b) { o = a & ~b; }
 };
 struct HbOpXor
 {
-  static const bool passthru_left = true;
-  static const bool passthru_right = true;
+  enum { passthru_left = true };
+  enum { passthru_right = true };
   template <typename T> static void process (T &o, const T &a, const T &b) { o = a ^ b; }
 };
 
diff --git a/src/hb-ot-kern-table.hh b/src/hb-ot-kern-table.hh
index b57ebaea8..3b71ac809 100644
--- a/src/hb-ot-kern-table.hh
+++ b/src/hb-ot-kern-table.hh
@@ -160,7 +160,7 @@ struct KernSubTable
 
 struct KernOTSubTableHeader
 {
-  static const bool apple = false;
+  enum { apple = false };
   typedef AAT::ObsoleteTypes Types;
 
   inline unsigned int tuple_count (void) const { return 0; }
@@ -215,7 +215,7 @@ struct KernOT : AAT::KerxTable<KernOT>
 
 struct KernAATSubTableHeader
 {
-  static const bool apple = true;
+  enum { apple = true };
   typedef AAT::ObsoleteTypes Types;
 
   inline unsigned int tuple_count (void) const { return 0; }
diff --git a/src/hb-ot-layout.cc b/src/hb-ot-layout.cc
index d0b22efe3..b08ee7f60 100644
--- a/src/hb-ot-layout.cc
+++ b/src/hb-ot-layout.cc
@@ -1299,7 +1299,7 @@ hb_ot_layout_feature_get_characters (hb_face_t      *face,
 struct GSUBProxy
 {
   enum { table_index = 0 };
-  static const bool inplace = false;
+  enum { inplace = false };
   typedef OT::SubstLookup Lookup;
 
   GSUBProxy (hb_face_t *face) :
@@ -1313,7 +1313,7 @@ struct GSUBProxy
 struct GPOSProxy
 {
   enum { table_index = 1 };
-  static const bool inplace = true;
+  enum { inplace = true };
   typedef OT::PosLookup Lookup;
 
   GPOSProxy (hb_face_t *face) :