include changed from by quotes ("") to by brackets (<>); close #3032

44 files changed, 160 insertions, 160 deletions

diff --git a/mrbgems/mruby-array-ext/src/array.c b/mrbgems/mruby-array-ext/src/array.c
index 177dd7123..d5c96e2cc 100644
--- a/mrbgems/mruby-array-ext/src/array.c
+++ b/mrbgems/mruby-array-ext/src/array.c
@@ -1,8 +1,8 @@
-#include "mruby.h"
-#include "mruby/value.h"
-#include "mruby/array.h"
-#include "mruby/range.h"
-#include "mruby/hash.h"
+#include <mruby.h>
+#include <mruby/value.h>
+#include <mruby/array.h>
+#include <mruby/range.h>
+#include <mruby/hash.h>
 
 /*
  *  call-seq:
diff --git a/mrbgems/mruby-bin-debugger/tools/mrdb/apibreak.c b/mrbgems/mruby-bin-debugger/tools/mrdb/apibreak.c
index 378c773ea..986c69d82 100755
--- a/mrbgems/mruby-bin-debugger/tools/mrdb/apibreak.c
+++ b/mrbgems/mruby-bin-debugger/tools/mrdb/apibreak.c
@@ -4,14 +4,14 @@
 */
 
 #include <string.h>
-#include "mruby.h"
-#include "mruby/irep.h"
+#include <mruby.h>
+#include <mruby/irep.h>
 #include "mrdb.h"
-#include "mruby/debug.h"
-#include "mruby/opcode.h"
-#include "mruby/class.h"
-#include "mruby/proc.h"
-#include "mruby/variable.h"
+#include <mruby/debug.h>
+#include <mruby/opcode.h>
+#include <mruby/class.h>
+#include <mruby/proc.h>
+#include <mruby/variable.h>
 #include "mrdberror.h"
 #include "apibreak.h"
 
diff --git a/mrbgems/mruby-bin-debugger/tools/mrdb/apibreak.h b/mrbgems/mruby-bin-debugger/tools/mrdb/apibreak.h
index 8bb39cb50..3c7e41e52 100755
--- a/mrbgems/mruby-bin-debugger/tools/mrdb/apibreak.h
+++ b/mrbgems/mruby-bin-debugger/tools/mrdb/apibreak.h
@@ -6,7 +6,7 @@
 #ifndef APIBREAK_H_
 #define APIBREAK_H_
 
-#include "mruby.h"
+#include <mruby.h>
 #include "mrdb.h"
 
 int32_t mrb_debug_set_break_line( mrb_state *, mrb_debug_context *, const char *, uint16_t );
diff --git a/mrbgems/mruby-bin-debugger/tools/mrdb/apilist.c b/mrbgems/mruby-bin-debugger/tools/mrdb/apilist.c
index 03846cd50..1c77d1ef8 100755
--- a/mrbgems/mruby-bin-debugger/tools/mrdb/apilist.c
+++ b/mrbgems/mruby-bin-debugger/tools/mrdb/apilist.c
@@ -9,9 +9,9 @@
 #include "mrdb.h"
 #include "mrdberror.h"
 #include "apilist.h"
-#include "mruby/compile.h"
-#include "mruby/irep.h"
-#include "mruby/debug.h"
+#include <mruby/compile.h>
+#include <mruby/irep.h>
+#include <mruby/debug.h>
 
 #define LINE_BUF_SIZE MAX_COMMAND_LINE
 
diff --git a/mrbgems/mruby-bin-debugger/tools/mrdb/apilist.h b/mrbgems/mruby-bin-debugger/tools/mrdb/apilist.h
index 4580b2350..6c4107885 100755
--- a/mrbgems/mruby-bin-debugger/tools/mrdb/apilist.h
+++ b/mrbgems/mruby-bin-debugger/tools/mrdb/apilist.h
@@ -5,7 +5,7 @@
 #ifndef APILIST_H_
 #define APILIST_H_
 
-#include "mruby.h"
+#include <mruby.h>
 #include "mrdb.h"
 
 int32_t mrb_debug_list(mrb_state *, mrb_debug_context *, char *, uint16_t, uint16_t);
diff --git a/mrbgems/mruby-bin-debugger/tools/mrdb/apiprint.c b/mrbgems/mruby-bin-debugger/tools/mrdb/apiprint.c
index 2c93eb4ee..a9c895b55 100755
--- a/mrbgems/mruby-bin-debugger/tools/mrdb/apiprint.c
+++ b/mrbgems/mruby-bin-debugger/tools/mrdb/apiprint.c
@@ -5,12 +5,12 @@
 
 #include <string.h>
 #include "mrdb.h"
-#include "mruby/value.h"
-#include "mruby/class.h"
-#include "mruby/compile.h"
-#include "mruby/error.h"
-#include "mruby/numeric.h"
-#include "mruby/string.h"
+#include <mruby/value.h>
+#include <mruby/class.h>
+#include <mruby/compile.h>
+#include <mruby/error.h>
+#include <mruby/numeric.h>
+#include <mruby/string.h>
 #include "apiprint.h"
 
 static void
diff --git a/mrbgems/mruby-bin-debugger/tools/mrdb/apiprint.h b/mrbgems/mruby-bin-debugger/tools/mrdb/apiprint.h
index 81d685e0c..e256f6262 100755
--- a/mrbgems/mruby-bin-debugger/tools/mrdb/apiprint.h
+++ b/mrbgems/mruby-bin-debugger/tools/mrdb/apiprint.h
@@ -5,7 +5,7 @@
 #ifndef APIPRINT_H_
 #define APIPRINT_H_
 
-#include "mruby.h"
+#include <mruby.h>
 #include "mrdb.h"
 
 mrb_value mrb_debug_eval(mrb_state*, mrb_debug_context*, const char*, size_t, mrb_bool*);
diff --git a/mrbgems/mruby-bin-debugger/tools/mrdb/cmdbreak.c b/mrbgems/mruby-bin-debugger/tools/mrdb/cmdbreak.c
index b913915c3..57c1d5682 100755
--- a/mrbgems/mruby-bin-debugger/tools/mrdb/cmdbreak.c
+++ b/mrbgems/mruby-bin-debugger/tools/mrdb/cmdbreak.c
@@ -5,10 +5,10 @@
 
 #include <ctype.h>
 #include <string.h>
-#include "mruby.h"
-#include "mruby/dump.h"
-#include "mruby/debug.h"
-#include "mruby/string.h"
+#include <mruby.h>
+#include <mruby/dump.h>
+#include <mruby/debug.h>
+#include <mruby/string.h>
 #include "mrdb.h"
 #include "mrdberror.h"
 #include "apibreak.h"
diff --git a/mrbgems/mruby-bin-debugger/tools/mrdb/cmdmisc.c b/mrbgems/mruby-bin-debugger/tools/mrdb/cmdmisc.c
index f52514851..b4aeb62d4 100755
--- a/mrbgems/mruby-bin-debugger/tools/mrdb/cmdmisc.c
+++ b/mrbgems/mruby-bin-debugger/tools/mrdb/cmdmisc.c
@@ -8,7 +8,7 @@
 #include <string.h>
 
 #include "apilist.h"
-#include "mruby/compile.h"
+#include <mruby/compile.h>
 
 typedef struct help_msg {
   const char *cmd1;
diff --git a/mrbgems/mruby-bin-debugger/tools/mrdb/cmdprint.c b/mrbgems/mruby-bin-debugger/tools/mrdb/cmdprint.c
index a617aff13..cca636711 100755
--- a/mrbgems/mruby-bin-debugger/tools/mrdb/cmdprint.c
+++ b/mrbgems/mruby-bin-debugger/tools/mrdb/cmdprint.c
@@ -5,12 +5,12 @@
 
 #include <string.h>
 #include "mrdb.h"
-#include "mruby/value.h"
-#include "mruby/class.h"
-#include "mruby/compile.h"
-#include "mruby/error.h"
-#include "mruby/numeric.h"
-#include "mruby/string.h"
+#include <mruby/value.h>
+#include <mruby/class.h>
+#include <mruby/compile.h>
+#include <mruby/error.h>
+#include <mruby/numeric.h>
+#include <mruby/string.h>
 #include "apiprint.h"
 
 dbgcmd_state
diff --git a/mrbgems/mruby-bin-debugger/tools/mrdb/cmdrun.c b/mrbgems/mruby-bin-debugger/tools/mrdb/cmdrun.c
index 8d8340560..7e0f171e4 100755
--- a/mrbgems/mruby-bin-debugger/tools/mrdb/cmdrun.c
+++ b/mrbgems/mruby-bin-debugger/tools/mrdb/cmdrun.c
@@ -3,7 +3,7 @@
 **
 */
 
-#include "mruby/opcode.h"
+#include <mruby/opcode.h>
 #include "mrdb.h"
 
 dbgcmd_state
diff --git a/mrbgems/mruby-bin-debugger/tools/mrdb/mrdb.c b/mrbgems/mruby-bin-debugger/tools/mrdb/mrdb.c
index 3e43fdb4a..317547d86 100755
--- a/mrbgems/mruby-bin-debugger/tools/mrdb/mrdb.c
+++ b/mrbgems/mruby-bin-debugger/tools/mrdb/mrdb.c
@@ -8,12 +8,12 @@
 #include <stdio.h>
 #include <ctype.h>
 
-#include "mruby.h"
-#include "mruby/dump.h"
-#include "mruby/debug.h"
-#include "mruby/class.h"
-#include "mruby/opcode.h"
-#include "mruby/variable.h"
+#include <mruby.h>
+#include <mruby/dump.h>
+#include <mruby/debug.h>
+#include <mruby/class.h>
+#include <mruby/opcode.h>
+#include <mruby/variable.h>
 
 #include "mrdb.h"
 #include "apibreak.h"
diff --git a/mrbgems/mruby-bin-debugger/tools/mrdb/mrdb.h b/mrbgems/mruby-bin-debugger/tools/mrdb/mrdb.h
index 9e92ce879..5d897170a 100755
--- a/mrbgems/mruby-bin-debugger/tools/mrdb/mrdb.h
+++ b/mrbgems/mruby-bin-debugger/tools/mrdb/mrdb.h
@@ -6,7 +6,7 @@
 #ifndef MRDB_H
 #define MRDB_H
 
-#include "mruby.h"
+#include <mruby.h>
 
 #include "mrdbconf.h"
 
diff --git a/mrbgems/mruby-bin-mirb/tools/mirb/mirb.c b/mrbgems/mruby-bin-mirb/tools/mirb/mirb.c
index 37fda352c..42c88b811 100644
--- a/mrbgems/mruby-bin-mirb/tools/mirb/mirb.c
+++ b/mrbgems/mruby-bin-mirb/tools/mirb/mirb.c
@@ -29,11 +29,11 @@
 #define MIRB_USING_HISTORY()
 #endif
 
-#include "mruby.h"
-#include "mruby/array.h"
-#include "mruby/proc.h"
-#include "mruby/compile.h"
-#include "mruby/string.h"
+#include <mruby.h>
+#include <mruby/array.h>
+#include <mruby/proc.h>
+#include <mruby/compile.h>
+#include <mruby/string.h>
 
 #ifdef ENABLE_READLINE
 
diff --git a/mrbgems/mruby-bin-mrbc/tools/mrbc/mrbc.c b/mrbgems/mruby-bin-mrbc/tools/mrbc/mrbc.c
index 2f507904a..580c2e25b 100644
--- a/mrbgems/mruby-bin-mrbc/tools/mrbc/mrbc.c
+++ b/mrbgems/mruby-bin-mrbc/tools/mrbc/mrbc.c
@@ -1,10 +1,10 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include "mruby.h"
-#include "mruby/compile.h"
-#include "mruby/dump.h"
-#include "mruby/proc.h"
+#include <mruby.h>
+#include <mruby/compile.h>
+#include <mruby/dump.h>
+#include <mruby/proc.h>
 
 #define RITEBIN_EXT ".mrb"
 #define C_EXT       ".c"
diff --git a/mrbgems/mruby-bin-mruby/tools/mruby/mruby.c b/mrbgems/mruby-bin-mruby/tools/mruby/mruby.c
index 4b801bb3b..ab6c6688f 100644
--- a/mrbgems/mruby-bin-mruby/tools/mruby/mruby.c
+++ b/mrbgems/mruby-bin-mruby/tools/mruby/mruby.c
@@ -1,11 +1,11 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include "mruby.h"
-#include "mruby/array.h"
-#include "mruby/compile.h"
-#include "mruby/dump.h"
-#include "mruby/variable.h"
+#include <mruby.h>
+#include <mruby/array.h>
+#include <mruby/compile.h>
+#include <mruby/dump.h>
+#include <mruby/variable.h>
 
 #ifdef MRB_DISABLE_STDIO
 static void
diff --git a/mrbgems/mruby-bin-strip/tools/mruby-strip/mruby-strip.c b/mrbgems/mruby-bin-strip/tools/mruby-strip/mruby-strip.c
index 0529d3938..1fd2bc5eb 100644
--- a/mrbgems/mruby-bin-strip/tools/mruby-strip/mruby-strip.c
+++ b/mrbgems/mruby-bin-strip/tools/mruby-strip/mruby-strip.c
@@ -1,9 +1,9 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include "mruby.h"
-#include "mruby/irep.h"
-#include "mruby/dump.h"
+#include <mruby.h>
+#include <mruby/irep.h>
+#include <mruby/dump.h>
 
 struct strip_args {
   int argc_start;
diff --git a/mrbgems/mruby-compiler/core/codegen.c b/mrbgems/mruby-compiler/core/codegen.c
index 7d84dee6e..c56c1550c 100644
--- a/mrbgems/mruby-compiler/core/codegen.c
+++ b/mrbgems/mruby-compiler/core/codegen.c
@@ -8,16 +8,16 @@
 #include <limits.h>
 #include <stdlib.h>
 #include <string.h>
-#include "mruby.h"
-#include "mruby/compile.h"
-#include "mruby/proc.h"
-#include "mruby/numeric.h"
-#include "mruby/string.h"
-#include "mruby/debug.h"
+#include <mruby.h>
+#include <mruby/compile.h>
+#include <mruby/proc.h>
+#include <mruby/numeric.h>
+#include <mruby/string.h>
+#include <mruby/debug.h>
 #include "node.h"
-#include "mruby/opcode.h"
-#include "mruby/re.h"
-#include "mruby/throw.h"
+#include <mruby/opcode.h>
+#include <mruby/re.h>
+#include <mruby/throw.h>
 
 typedef mrb_ast_node node;
 typedef struct mrb_parser_state parser_state;
diff --git a/mrbgems/mruby-compiler/core/parse.y b/mrbgems/mruby-compiler/core/parse.y
index ff135e000..e46ff5b98 100644
--- a/mrbgems/mruby-compiler/core/parse.y
+++ b/mrbgems/mruby-compiler/core/parse.y
@@ -22,12 +22,12 @@
 #include <errno.h>
 #include <stdlib.h>
 #include <string.h>
-#include "mruby.h"
-#include "mruby/compile.h"
-#include "mruby/proc.h"
-#include "mruby/error.h"
+#include <mruby.h>
+#include <mruby/compile.h>
+#include <mruby/proc.h>
+#include <mruby/error.h>
+#include <mruby/throw.h>
 #include "node.h"
-#include "mruby/throw.h"
 
 #define YYLEX_PARAM p
 
diff --git a/mrbgems/mruby-error/src/exception.c b/mrbgems/mruby-error/src/exception.c
index 911fde0be..170abb699 100644
--- a/mrbgems/mruby-error/src/exception.c
+++ b/mrbgems/mruby-error/src/exception.c
@@ -1,6 +1,6 @@
-#include "mruby.h"
-#include "mruby/throw.h"
-#include "mruby/error.h"
+#include <mruby.h>
+#include <mruby/throw.h>
+#include <mruby/error.h>
 
 MRB_API mrb_value
 mrb_protect(mrb_state *mrb, mrb_func_t body, mrb_value data, mrb_bool *state)
diff --git a/mrbgems/mruby-error/test/exception.c b/mrbgems/mruby-error/test/exception.c
index 2a943aaae..4de0e9607 100644
--- a/mrbgems/mruby-error/test/exception.c
+++ b/mrbgems/mruby-error/test/exception.c
@@ -1,6 +1,6 @@
-#include "mruby.h"
-#include "mruby/error.h"
-#include "mruby/array.h"
+#include <mruby.h>
+#include <mruby/error.h>
+#include <mruby/array.h>
 
 static mrb_value
 protect_cb(mrb_state *mrb, mrb_value b)
diff --git a/mrbgems/mruby-eval/src/eval.c b/mrbgems/mruby-eval/src/eval.c
index dd5fd5024..eef1f5046 100644
--- a/mrbgems/mruby-eval/src/eval.c
+++ b/mrbgems/mruby-eval/src/eval.c
@@ -1,9 +1,9 @@
-#include "mruby.h"
-#include "mruby/class.h"
-#include "mruby/compile.h"
-#include "mruby/irep.h"
-#include "mruby/proc.h"
-#include "mruby/opcode.h"
+#include <mruby.h>
+#include <mruby/class.h>
+#include <mruby/compile.h>
+#include <mruby/irep.h>
+#include <mruby/proc.h>
+#include <mruby/opcode.h>
 
 static struct mrb_irep *
 get_closure_irep(mrb_state *mrb, int level)
diff --git a/mrbgems/mruby-exit/src/mruby-exit.c b/mrbgems/mruby-exit/src/mruby-exit.c
index 726dfd7c4..3e147f80b 100644
--- a/mrbgems/mruby-exit/src/mruby-exit.c
+++ b/mrbgems/mruby-exit/src/mruby-exit.c
@@ -1,5 +1,5 @@
 #include <stdlib.h>
-#include "mruby.h"
+#include <mruby.h>
 
 static mrb_value
 f_exit(mrb_state *mrb, mrb_value self)
diff --git a/mrbgems/mruby-fiber/src/fiber.c b/mrbgems/mruby-fiber/src/fiber.c
index 93b3f1227..c140b6eac 100644
--- a/mrbgems/mruby-fiber/src/fiber.c
+++ b/mrbgems/mruby-fiber/src/fiber.c
@@ -1,7 +1,7 @@
-#include "mruby.h"
-#include "mruby/array.h"
-#include "mruby/class.h"
-#include "mruby/proc.h"
+#include <mruby.h>
+#include <mruby/array.h>
+#include <mruby/class.h>
+#include <mruby/proc.h>
 
 #define fiber_ptr(o) ((struct RFiber*)mrb_ptr(o))
 
diff --git a/mrbgems/mruby-hash-ext/src/hash-ext.c b/mrbgems/mruby-hash-ext/src/hash-ext.c
index bce842cb4..9560829b6 100644
--- a/mrbgems/mruby-hash-ext/src/hash-ext.c
+++ b/mrbgems/mruby-hash-ext/src/hash-ext.c
@@ -4,9 +4,9 @@
 ** See Copyright Notice in mruby.h
 */
 
-#include "mruby.h"
-#include "mruby/array.h"
-#include "mruby/hash.h"
+#include <mruby.h>
+#include <mruby/array.h>
+#include <mruby/hash.h>
 
 /*
  * call-seq:
diff --git a/mrbgems/mruby-kernel-ext/src/kernel.c b/mrbgems/mruby-kernel-ext/src/kernel.c
index c578b6793..74aa555d0 100644
--- a/mrbgems/mruby-kernel-ext/src/kernel.c
+++ b/mrbgems/mruby-kernel-ext/src/kernel.c
@@ -1,7 +1,7 @@
-#include "mruby.h"
-#include "mruby/error.h"
-#include "mruby/array.h"
-#include "mruby/hash.h"
+#include <mruby.h>
+#include <mruby/error.h>
+#include <mruby/array.h>
+#include <mruby/hash.h>
 
 /*
  *  call-seq:
diff --git a/mrbgems/mruby-math/src/math.c b/mrbgems/mruby-math/src/math.c
index 8053f3832..b2bd81e4e 100644
--- a/mrbgems/mruby-math/src/math.c
+++ b/mrbgems/mruby-math/src/math.c
@@ -4,8 +4,8 @@
 ** See Copyright Notice in mruby.h
 */
 
-#include "mruby.h"
-#include "mruby/array.h"
+#include <mruby.h>
+#include <mruby/array.h>
 
 #include <math.h>
 
diff --git a/mrbgems/mruby-numeric-ext/src/numeric_ext.c b/mrbgems/mruby-numeric-ext/src/numeric_ext.c
index 22c1668fa..f71236a32 100644
--- a/mrbgems/mruby-numeric-ext/src/numeric_ext.c
+++ b/mrbgems/mruby-numeric-ext/src/numeric_ext.c
@@ -1,5 +1,5 @@
 #include <limits.h>
-#include "mruby.h"
+#include <mruby.h>
 
 static mrb_value
 mrb_int_chr(mrb_state *mrb, mrb_value x)
diff --git a/mrbgems/mruby-object-ext/src/object.c b/mrbgems/mruby-object-ext/src/object.c
index dc1924db0..3eba95633 100644
--- a/mrbgems/mruby-object-ext/src/object.c
+++ b/mrbgems/mruby-object-ext/src/object.c
@@ -1,6 +1,6 @@
-#include "mruby.h"
-#include "mruby/array.h"
-#include "mruby/class.h"
+#include <mruby.h>
+#include <mruby/array.h>
+#include <mruby/class.h>
 
 /*
  *  call-seq:
diff --git a/mrbgems/mruby-objectspace/src/mruby_objectspace.c b/mrbgems/mruby-objectspace/src/mruby_objectspace.c
index d516735cf..d5cd4f5a1 100644
--- a/mrbgems/mruby-objectspace/src/mruby_objectspace.c
+++ b/mrbgems/mruby-objectspace/src/mruby_objectspace.c
@@ -1,7 +1,7 @@
-#include "mruby.h"
-#include "mruby/gc.h"
-#include "mruby/hash.h"
-#include "mruby/class.h"
+#include <mruby.h>
+#include <mruby/gc.h>
+#include <mruby/hash.h>
+#include <mruby/class.h>
 
 struct os_count_struct {
   mrb_int total;
diff --git a/mrbgems/mruby-print/src/print.c b/mrbgems/mruby-print/src/print.c
index 9b09b12cc..f69254076 100644
--- a/mrbgems/mruby-print/src/print.c
+++ b/mrbgems/mruby-print/src/print.c
@@ -1,5 +1,5 @@
-#include "mruby.h"
-#include "mruby/string.h"
+#include <mruby.h>
+#include <mruby/string.h>
 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>
diff --git a/mrbgems/mruby-proc-ext/src/proc.c b/mrbgems/mruby-proc-ext/src/proc.c
index 73873a360..c8c8f1aa1 100644
--- a/mrbgems/mruby-proc-ext/src/proc.c
+++ b/mrbgems/mruby-proc-ext/src/proc.c
@@ -1,9 +1,9 @@
-#include "mruby.h"
-#include "mruby/proc.h"
-#include "mruby/opcode.h"
-#include "mruby/array.h"
-#include "mruby/string.h"
-#include "mruby/debug.h"
+#include <mruby.h>
+#include <mruby/proc.h>
+#include <mruby/opcode.h>
+#include <mruby/array.h>
+#include <mruby/string.h>
+#include <mruby/debug.h>
 
 static mrb_value
 mrb_proc_lambda(mrb_state *mrb, mrb_value self)
diff --git a/mrbgems/mruby-proc-ext/test/proc.c b/mrbgems/mruby-proc-ext/test/proc.c
index fcf8e2612..a77b68e9d 100644
--- a/mrbgems/mruby-proc-ext/test/proc.c
+++ b/mrbgems/mruby-proc-ext/test/proc.c
@@ -1,6 +1,6 @@
-#include "mruby.h"
-#include "mruby/proc.h"
-#include "mruby/class.h"
+#include <mruby.h>
+#include <mruby/proc.h>
+#include <mruby/class.h>
 
 static mrb_value
 return_func_name(mrb_state *mrb, mrb_value self)
diff --git a/mrbgems/mruby-random/src/mt19937ar.c b/mrbgems/mruby-random/src/mt19937ar.c
index 310a276fa..4013ad30b 100644
--- a/mrbgems/mruby-random/src/mt19937ar.c
+++ b/mrbgems/mruby-random/src/mt19937ar.c
@@ -4,7 +4,7 @@
 ** See Copyright Notice in mruby.h
 */
 
-#include "mruby.h"
+#include <mruby.h>
 #include "mt19937ar.h"
 
 /* Period parameters */
diff --git a/mrbgems/mruby-random/src/random.c b/mrbgems/mruby-random/src/random.c
index 3be3ac81c..040d83ed6 100644
--- a/mrbgems/mruby-random/src/random.c
+++ b/mrbgems/mruby-random/src/random.c
@@ -4,11 +4,11 @@
 ** See Copyright Notice in mruby.h
 */
 
-#include "mruby.h"
-#include "mruby/variable.h"
-#include "mruby/class.h"
-#include "mruby/data.h"
-#include "mruby/array.h"
+#include <mruby.h>
+#include <mruby/variable.h>
+#include <mruby/class.h>
+#include <mruby/data.h>
+#include <mruby/array.h>
 #include "mt19937ar.h"
 
 #include <time.h>
diff --git a/mrbgems/mruby-range-ext/src/range.c b/mrbgems/mruby-range-ext/src/range.c
index 35632ad20..4d6f1684f 100644
--- a/mrbgems/mruby-range-ext/src/range.c
+++ b/mrbgems/mruby-range-ext/src/range.c
@@ -1,5 +1,5 @@
-#include "mruby.h"
-#include "mruby/range.h"
+#include <mruby.h>
+#include <mruby/range.h>
 #include <math.h>
 
 static mrb_bool
diff --git a/mrbgems/mruby-sprintf/src/kernel.c b/mrbgems/mruby-sprintf/src/kernel.c
index bd4f2bca1..946b43a8a 100644
--- a/mrbgems/mruby-sprintf/src/kernel.c
+++ b/mrbgems/mruby-sprintf/src/kernel.c
@@ -4,7 +4,7 @@
 ** See Copyright Notice in mruby.h
 */
 
-#include "mruby.h"
+#include <mruby.h>
 
 mrb_value mrb_f_sprintf(mrb_state *mrb, mrb_value obj); /* in sprintf.c */
 
diff --git a/mrbgems/mruby-sprintf/src/sprintf.c b/mrbgems/mruby-sprintf/src/sprintf.c
index 0a964801e..33e0931f9 100644
--- a/mrbgems/mruby-sprintf/src/sprintf.c
+++ b/mrbgems/mruby-sprintf/src/sprintf.c
@@ -4,14 +4,14 @@
 ** See Copyright Notice in mruby.h
 */
 
-#include "mruby.h"
+#include <mruby.h>
 
 #include <limits.h>
 #include <stdio.h>
 #include <string.h>
-#include "mruby/string.h"
-#include "mruby/hash.h"
-#include "mruby/numeric.h"
+#include <mruby/string.h>
+#include <mruby/hash.h>
+#include <mruby/numeric.h>
 #include <math.h>
 #include <ctype.h>
 
diff --git a/mrbgems/mruby-string-ext/src/string.c b/mrbgems/mruby-string-ext/src/string.c
index 0afc53386..c2ee1fc23 100644
--- a/mrbgems/mruby-string-ext/src/string.c
+++ b/mrbgems/mruby-string-ext/src/string.c
@@ -1,9 +1,9 @@
 #include <string.h>
-#include "mruby.h"
-#include "mruby/array.h"
-#include "mruby/class.h"
-#include "mruby/string.h"
-#include "mruby/range.h"
+#include <mruby.h>
+#include <mruby/array.h>
+#include <mruby/class.h>
+#include <mruby/string.h>
+#include <mruby/range.h>
 
 static mrb_value
 mrb_str_getbyte(mrb_state *mrb, mrb_value str)
diff --git a/mrbgems/mruby-struct/src/struct.c b/mrbgems/mruby-struct/src/struct.c
index 342e3eb5e..17455c155 100644
--- a/mrbgems/mruby-struct/src/struct.c
+++ b/mrbgems/mruby-struct/src/struct.c
@@ -5,13 +5,13 @@
 */
 
 #include <string.h>
-#include "mruby.h"
-#include "mruby/array.h"
-#include "mruby/string.h"
-#include "mruby/class.h"
-#include "mruby/variable.h"
-#include "mruby/hash.h"
-#include "mruby/range.h"
+#include <mruby.h>
+#include <mruby/array.h>
+#include <mruby/string.h>
+#include <mruby/class.h>
+#include <mruby/variable.h>
+#include <mruby/hash.h>
+#include <mruby/range.h>
 
 #define RSTRUCT_LEN(st) mrb_ary_ptr(st)->len
 #define RSTRUCT_PTR(st) mrb_ary_ptr(st)->ptr
diff --git a/mrbgems/mruby-symbol-ext/src/symbol.c b/mrbgems/mruby-symbol-ext/src/symbol.c
index a96c4017f..a992dbfce 100644
--- a/mrbgems/mruby-symbol-ext/src/symbol.c
+++ b/mrbgems/mruby-symbol-ext/src/symbol.c
@@ -1,6 +1,6 @@
-#include "mruby.h"
-#include "mruby/khash.h"
-#include "mruby/array.h"
+#include <mruby.h>
+#include <mruby/khash.h>
+#include <mruby/array.h>
 
 typedef struct symbol_name {
   size_t len;
diff --git a/mrbgems/mruby-test/driver.c b/mrbgems/mruby-test/driver.c
index 7f0633723..7cc5211f0 100644
--- a/mrbgems/mruby-test/driver.c
+++ b/mrbgems/mruby-test/driver.c
@@ -10,13 +10,13 @@
 #include <stdlib.h>
 #include <string.h>
 
-#include "mruby.h"
-#include "mruby/proc.h"
-#include "mruby/data.h"
-#include "mruby/compile.h"
-#include "mruby/string.h"
-#include "mruby/variable.h"
-#include "mruby/array.h"
+#include <mruby.h>
+#include <mruby/proc.h>
+#include <mruby/data.h>
+#include <mruby/compile.h>
+#include <mruby/string.h>
+#include <mruby/variable.h>
+#include <mruby/array.h>
 
 void
 mrb_init_mrbtest(mrb_state *);
diff --git a/mrbgems/mruby-test/init_mrbtest.c b/mrbgems/mruby-test/init_mrbtest.c
index da03d946d..17ac1bdef 100644
--- a/mrbgems/mruby-test/init_mrbtest.c
+++ b/mrbgems/mruby-test/init_mrbtest.c
@@ -1,7 +1,7 @@
 #include <stdlib.h>
-#include "mruby.h"
-#include "mruby/irep.h"
-#include "mruby/variable.h"
+#include <mruby.h>
+#include <mruby/irep.h>
+#include <mruby/variable.h>
 
 extern const uint8_t mrbtest_assert_irep[];
 
diff --git a/mrbgems/mruby-time/src/time.c b/mrbgems/mruby-time/src/time.c
index c18ac7568..2a4347b7c 100644
--- a/mrbgems/mruby-time/src/time.c
+++ b/mrbgems/mruby-time/src/time.c
@@ -7,9 +7,9 @@
 #include <math.h>
 #include <stdio.h>
 #include <time.h>
-#include "mruby.h"
-#include "mruby/class.h"
-#include "mruby/data.h"
+#include <mruby.h>
+#include <mruby/class.h>
+#include <mruby/data.h>
 
 #if !defined(__MINGW64__) && defined(_WIN32)
 # define llround(x) round(x)