diff --git a/deps/pcre2/pcre2_compile.c b/deps/pcre2/pcre2_compile.c
index f126e41b7..32e86cba6 100644
--- a/deps/pcre2/pcre2_compile.c
+++ b/deps/pcre2/pcre2_compile.c
@@ -6086,6 +6086,8 @@ uint32_t meta, meta_arg;
 uint32_t firstcuflags, reqcuflags;
 uint32_t zeroreqcuflags, zerofirstcuflags;
 uint32_t req_caseopt, reqvary, tempreqvary;
+uint32_t j;
+int i;
 /* Some opcodes, such as META_CAPTURE_NUMBER or META_CAPTURE_NAME,
 depends on the previous value of offset. */
 PCRE2_SIZE offset = 0;
@@ -6542,7 +6544,7 @@ for (;; pptr++)
     verbarglen = *(++pptr);
     verbculen = 0;
     tempcode = code++;
-    for (int i = 0; i < (int)verbarglen; i++)
+    for (i = 0; i < (int)verbarglen; i++)
       {
       meta = *(++pptr);
 #ifdef SUPPORT_UNICODE
@@ -7482,7 +7484,7 @@ for (;; pptr++)
             }
           *lengthptr += delta;
           }
-        else for (int i = 0; i < replicate; i++)
+        else for (i = 0; i < replicate; i++)
           {
           memcpy(code, previous, CU2BYTES(length_prevgroup));
           previous = code;
@@ -7665,7 +7667,7 @@ for (;; pptr++)
                 reqcu = firstcu;
                 reqcuflags = firstcuflags;
                 }
-              for (uint32_t i = 1; i < repeat_min; i++)
+              for (j = 1; j < repeat_min; j++)
                 {
                 memcpy(code, previous, CU2BYTES(len));
                 code += len;
@@ -7707,7 +7709,7 @@ for (;; pptr++)
 
           /* This is compiling for real */
 
-          else for (uint32_t i = repeat_max; i >= 1; i--)
+          else for (i = repeat_max; i >= 1; i--)
             {
             *code++ = OP_BRAZERO + repeat_type;
 
diff --git a/deps/pcre2/pcre2_compile_class.c b/deps/pcre2/pcre2_compile_class.c
index 9a1fc022f..eed74b32c 100644
--- a/deps/pcre2/pcre2_compile_class.c
+++ b/deps/pcre2/pcre2_compile_class.c
@@ -1076,6 +1076,7 @@ const uint8_t *cbits = cb->cbits;
 /* Some functions such as add_to_class() or eclass processing
 expects that the bitset is stored in cb->classbits.classbits. */
 uint8_t *const classbits = cb->classbits.classbits;
+int i;
 
 #ifdef SUPPORT_UNICODE
 BOOL utf = (options & PCRE2_UTF) != 0;
@@ -1173,6 +1174,7 @@ while (TRUE)
   int taboffset, tabopt;
   class_bits_storage pbits;
   uint32_t escape, c;
+  int i;
 
   /* Handle POSIX classes such as [:alpha:] etc. */
   switch (META_CODE(meta))
@@ -1272,10 +1274,10 @@ while (TRUE)
     if (taboffset >= 0)
       {
       if (tabopt >= 0)
-        for (int i = 0; i < 32; i++)
+        for (i = 0; i < 32; i++)
           pbits.classbits[i] |= cbits[i + taboffset];
       else
-        for (int i = 0; i < 32; i++)
+        for (i = 0; i < 32; i++)
           pbits.classbits[i] &= (uint8_t)(~cbits[i + taboffset]);
       }
 
@@ -1308,10 +1310,10 @@ while (TRUE)
       uint32_t *classwords = cb->classbits.classwords;
 
       if (local_negate)
-        for (int i = 0; i < 8; i++)
+        for (i = 0; i < 8; i++)
           classwords[i] |= (uint32_t)(~pbits.classwords[i]);
       else
-        for (int i = 0; i < 8; i++)
+        for (i = 0; i < 8; i++)
           classwords[i] |= pbits.classwords[i];
       }
 
@@ -1333,22 +1335,22 @@ while (TRUE)
     switch(escape)
       {
       case ESC_d:
-      for (int i = 0; i < 32; i++) classbits[i] |= cbits[i+cbit_digit];
+      for (i = 0; i < 32; i++) classbits[i] |= cbits[i+cbit_digit];
       break;
 
       case ESC_D:
       should_flip_negation = TRUE;
-      for (int i = 0; i < 32; i++)
+      for (i = 0; i < 32; i++)
         classbits[i] |= (uint8_t)(~cbits[i+cbit_digit]);
       break;
 
       case ESC_w:
-      for (int i = 0; i < 32; i++) classbits[i] |= cbits[i+cbit_word];
+      for (i = 0; i < 32; i++) classbits[i] |= cbits[i+cbit_word];
       break;
 
       case ESC_W:
       should_flip_negation = TRUE;
-      for (int i = 0; i < 32; i++)
+      for (i = 0; i < 32; i++)
         classbits[i] |= (uint8_t)(~cbits[i+cbit_word]);
       break;
 
@@ -1360,12 +1362,12 @@ while (TRUE)
       longer treat \s and \S specially. */
 
       case ESC_s:
-      for (int i = 0; i < 32; i++) classbits[i] |= cbits[i+cbit_space];
+      for (i = 0; i < 32; i++) classbits[i] |= cbits[i+cbit_space];
       break;
 
       case ESC_S:
       should_flip_negation = TRUE;
-      for (int i = 0; i < 32; i++)
+      for (i = 0; i < 32; i++)
         classbits[i] |= (uint8_t)(~cbits[i+cbit_space]);
       break;
 
@@ -1717,7 +1719,7 @@ if ((xclass_props & XCLASS_REQUIRED) != 0)
     if (negate_class)
       {
       uint32_t *classwords = cb->classbits.classwords;
-      for (int i = 0; i < 8; i++) classwords[i] = ~classwords[i];
+      for (i = 0; i < 8; i++) classwords[i] = ~classwords[i];
       }
 
     if (has_bitmap == NULL)
@@ -1838,7 +1840,7 @@ if (negate_class)
   {
   uint32_t *classwords = cb->classbits.classwords;
 
-  for (int i = 0; i < 8; i++) classwords[i] = ~classwords[i];
+  for (i = 0; i < 8; i++) classwords[i] = ~classwords[i];
   }
 
 if ((SELECT_VALUE8(!utf, 0) || negate_class != should_flip_negation) &&
@@ -1880,6 +1882,8 @@ static void
 fold_negation(eclass_op_info *pop_info, PCRE2_SIZE *lengthptr,
   BOOL preserve_classbits)
 {
+int i;
+
 /* If the chunk of stack code is already composed of multiple ops, we won't
 descend in and try and propagate the negation down the tree. (That would lead
 to O(n^2) compile-time, which could be exploitable with a malicious regex -
@@ -1916,7 +1920,7 @@ else
 
 if (!preserve_classbits)
   {
-  for (int i = 0; i < 8; i++)
+  for (i = 0; i < 8; i++)
     pop_info->bits.classwords[i] = ~pop_info->bits.classwords[i];
   }
 }
@@ -1930,6 +1934,8 @@ static void
 fold_binary(int op, eclass_op_info *lhs_op_info, eclass_op_info *rhs_op_info,
   PCRE2_SIZE *lengthptr)
 {
+int i;
+
 switch (op)
   {
   /* ECL_AND truth table:
@@ -1984,7 +1990,7 @@ switch (op)
     lhs_op_info->op_single_type = 0;
     }
 
-  for (int i = 0; i < 8; i++)
+  for (i = 0; i < 8; i++)
     lhs_op_info->bits.classwords[i] &= rhs_op_info->bits.classwords[i];
   break;
 
@@ -2040,7 +2046,7 @@ switch (op)
     lhs_op_info->op_single_type = 0;
     }
 
-  for (int i = 0; i < 8; i++)
+  for (i = 0; i < 8; i++)
     lhs_op_info->bits.classwords[i] |= rhs_op_info->bits.classwords[i];
   break;
 
@@ -2103,7 +2109,7 @@ switch (op)
     lhs_op_info->op_single_type = 0;
     }
 
-  for (int i = 0; i < 8; i++)
+  for (i = 0; i < 8; i++)
     lhs_op_info->bits.classwords[i] ^= rhs_op_info->bits.classwords[i];
   break;
 
@@ -2138,6 +2144,7 @@ PCRE2_UCHAR *code_start = code;
 PCRE2_SIZE prev_length = (lengthptr != NULL)? *lengthptr : 0;
 PCRE2_SIZE extra_length;
 uint32_t meta = META_CODE(*ptr);
+int i;
 
 switch (meta)
   {
@@ -2240,7 +2247,7 @@ switch (meta)
       {
       uint32_t *classwords = pop_info->bits.classwords;
 
-      for (int i = 0; i < 8; i++)
+      for (i = 0; i < 8; i++)
         if (classwords[i] != 0)
           {
           context->needs_bitmap = TRUE;
@@ -2578,6 +2585,7 @@ PCRE2_SIZE previous_length = (lengthptr != NULL)? *lengthptr : 0;
 PCRE2_UCHAR *code = *pcode;
 PCRE2_UCHAR *previous;
 BOOL allbitsone = TRUE;
+int i;
 
 context.needs_bitmap = FALSE;
 context.options = options;
@@ -2603,7 +2611,7 @@ if (lengthptr != NULL)
   }
 
 /* Do some useful counting of what's in the bitmap. */
-for (int i = 0; i < 8; i++)
+for (i = 0; i < 8; i++)
   if (op_info.bits.classwords[i] != 0xffffffff)
     {
     allbitsone = FALSE;
diff --git a/deps/pcre2/pcre2_convert.c b/deps/pcre2/pcre2_convert.c
index ad7312ab7..428773697 100644
--- a/deps/pcre2/pcre2_convert.c
+++ b/deps/pcre2/pcre2_convert.c
@@ -72,7 +72,8 @@ enum { POSIX_START_REGEX, POSIX_ANCHORED, POSIX_NOT_BRACKET,
 
 #define PUTCHARS(string) \
   { \
-  for (const char *s = string; *s != 0; s++) \
+  const char *s; \
+  for (s = string; *s != 0; s++) \
     { \
     if (p >= endp) return PCRE2_ERROR_NOMEMORY; \
     *p++ = *s; \
@@ -1125,6 +1126,7 @@ PCRE2_UCHAR *use_buffer = dummy_buffer;
 PCRE2_SIZE use_length = DUMMY_BUFFER_SIZE;
 BOOL utf = (options & PCRE2_CONVERT_UTF) != 0;
 uint32_t pattype = options & TYPE_OPTIONS;
+int i;
 
 if (pattern == NULL && plength == 0)
   pattern = null_str;
@@ -1180,7 +1182,7 @@ if (buffptr != NULL && *buffptr != NULL)
 /* Call an individual converter, either just once (if a buffer was provided or
 just the length is needed), or twice (if a memory allocation is required). */
 
-for (int i = 0; i < 2; i++)
+for (i = 0; i < 2; i++)
   {
   PCRE2_UCHAR *allocated;
   BOOL dummyrun = buffptr == NULL || *buffptr == NULL;
diff --git a/deps/pcre2/pcre2_dfa_match.c b/deps/pcre2/pcre2_dfa_match.c
index f507acf8d..a93b46112 100644
--- a/deps/pcre2/pcre2_dfa_match.c
+++ b/deps/pcre2/pcre2_dfa_match.c
@@ -2933,6 +2933,7 @@ for (;;)
         {
         int rc;
         int *local_workspace;
+	dfa_recursion_info *ri;
         PCRE2_SIZE *local_offsets;
         RWS_anchor *rws = (RWS_anchor *)RWS;
         PCRE2_SPTR callpat = start_code + GET(code, 1);
@@ -2957,7 +2958,7 @@ for (;;)
         pointer or last used character. This should catch convoluted mutual
         recursions. (Some simple cases are caught at compile time.) */
 
-        for (dfa_recursion_info *ri = mb->recursive;
+        for (ri = mb->recursive;
              ri != NULL;
              ri = ri->prevrec)
           {
diff --git a/deps/pcre2/pcre2_ord2utf.c b/deps/pcre2/pcre2_ord2utf.c
index 3b8aead75..1339483c3 100644
--- a/deps/pcre2/pcre2_ord2utf.c
+++ b/deps/pcre2/pcre2_ord2utf.c
@@ -80,12 +80,12 @@ PRIV(ord2utf)(uint32_t cvalue, PCRE2_UCHAR *buffer)
 /* Convert to UTF-8 */
 
 #if PCRE2_CODE_UNIT_WIDTH == 8
-unsigned int i;
+unsigned int i, j;
 
 for (i = 0; i < PRIV(utf8_table1_size); i++)
   if ((int)cvalue <= PRIV(utf8_table1)[i]) break;
 buffer += i;
-for (unsigned int j = i; j != 0; j--)
+for (j = i; j != 0; j--)
  {
  *buffer-- = 0x80 | (cvalue & 0x3f);
  cvalue >>= 6;
diff --git a/deps/pcre2/pcre2_script_run.c b/deps/pcre2/pcre2_script_run.c
index acdf41fe6..dac6f3aa0 100644
--- a/deps/pcre2/pcre2_script_run.c
+++ b/deps/pcre2/pcre2_script_run.c
@@ -89,6 +89,7 @@ uint32_t require_map[FULL_MAPSIZE];
 uint32_t map[FULL_MAPSIZE];
 uint32_t require_digitset = 0;
 uint32_t c;
+int i;
 
 #if PCRE2_CODE_UNIT_WIDTH == 32
 (void)utf;    /* Avoid compiler warning */
@@ -105,7 +106,7 @@ every script, as opposed to the maps in ucd_script_sets, which only have bits
 for scripts less than ucp_Unknown - those that appear in script extension
 lists. */
 
-for (int i = 0; i < FULL_MAPSIZE; i++) require_map[i] = 0;
+for (i = 0; i < FULL_MAPSIZE; i++) require_map[i] = 0;
 
 /* Scan strings of two or more characters, checking the Unicode characteristics
 of each code point. There is special code for scripts that can be combined with
@@ -244,7 +245,7 @@ for (;;)
       case SCRIPT_MAP:
       OK = FALSE;
 
-      for (int i = 0; i < FULL_MAPSIZE; i++)
+      for (i = 0; i < FULL_MAPSIZE; i++)
         {
         if ((require_map[i] & map[i]) != 0)
           {
@@ -281,7 +282,7 @@ for (;;)
         allowed scripts for this character. */
 
         default:
-        for (int i = 0; i < FULL_MAPSIZE; i++) require_map[i] &= map[i];
+        for (i = 0; i < FULL_MAPSIZE; i++) require_map[i] &= map[i];
         break;
         }
 
diff --git a/deps/pcre2/pcre2_study.c b/deps/pcre2/pcre2_study.c
index 9f7fd6bd6..52efc93ea 100644
--- a/deps/pcre2/pcre2_study.c
+++ b/deps/pcre2/pcre2_study.c
@@ -1095,6 +1095,7 @@ set_start_bits(pcre2_real_code *re, PCRE2_SPTR code, BOOL utf, BOOL ucp,
 {
 uint32_t c;
 int yield = SSB_DONE;
+BOOL done;
 
 #if defined SUPPORT_UNICODE && PCRE2_CODE_UNIT_WIDTH == 8
 int table_limit = utf? 16:32;
@@ -1261,7 +1262,7 @@ do
 
       /* Skip irrelevant items */
 
-      for (BOOL done = FALSE; !done;)
+      for (done = FALSE; !done;)
         {
         switch (*ncode)
           {
diff --git a/deps/pcre2/pcre2_substitute.c b/deps/pcre2/pcre2_substitute.c
index 5cb84748e..9787188e8 100644
--- a/deps/pcre2/pcre2_substitute.c
+++ b/deps/pcre2/pcre2_substitute.c
@@ -261,7 +261,7 @@ return FALSE;
 *************************************************/
 
 #define PCRE2_SUBSTITUTE_CASE_NONE                 0
-// 1, 2, 3 are PCRE2_SUBSTITUTE_CASE_LOWER, UPPER, TITLE_FIRST.
+/* 1, 2, 3 are PCRE2_SUBSTITUTE_CASE_LOWER, UPPER, TITLE_FIRST. */
 #define PCRE2_SUBSTITUTE_CASE_REVERSE_TITLE_FIRST  4
 
 typedef struct {
@@ -330,18 +330,18 @@ switch (state->to_case)
   return 0;
   /* LCOV_EXCL_STOP */
 
-  case PCRE2_SUBSTITUTE_CASE_LOWER: // Can be single_char TRUE or FALSE
-  case PCRE2_SUBSTITUTE_CASE_UPPER: // Can only be single_char FALSE
+  case PCRE2_SUBSTITUTE_CASE_LOWER: /* Can be single_char TRUE or FALSE */
+  case PCRE2_SUBSTITUTE_CASE_UPPER: /* Can only be single_char FALSE */
   next_to_upper = rest_to_upper = (state->to_case == PCRE2_SUBSTITUTE_CASE_UPPER);
   break;
 
-  case PCRE2_SUBSTITUTE_CASE_TITLE_FIRST: // Can be single_char TRUE or FALSE
+  case PCRE2_SUBSTITUTE_CASE_TITLE_FIRST: /* Can be single_char TRUE or FALSE */
   next_to_upper = TRUE;
   rest_to_upper = FALSE;
   state->to_case = PCRE2_SUBSTITUTE_CASE_LOWER;
   break;
 
-  case PCRE2_SUBSTITUTE_CASE_REVERSE_TITLE_FIRST: // Can only be single_char FALSE
+  case PCRE2_SUBSTITUTE_CASE_REVERSE_TITLE_FIRST: /* Can only be single_char FALSE */
   next_to_upper = FALSE;
   rest_to_upper = TRUE;
   state->to_case = PCRE2_SUBSTITUTE_CASE_UPPER;
@@ -470,9 +470,9 @@ switch (state->to_case)
   return 0;
   /* LCOV_EXCL_STOP */
 
-  case PCRE2_SUBSTITUTE_CASE_LOWER: // Can be single_char TRUE or FALSE
-  case PCRE2_SUBSTITUTE_CASE_UPPER: // Can only be single_char FALSE
-  case PCRE2_SUBSTITUTE_CASE_TITLE_FIRST: // Can be single_char TRUE or FALSE
+  case PCRE2_SUBSTITUTE_CASE_LOWER: /* Can be single_char TRUE or FALSE */
+  case PCRE2_SUBSTITUTE_CASE_UPPER: /* Can only be single_char FALSE */
+  case PCRE2_SUBSTITUTE_CASE_TITLE_FIRST: /* Can be single_char TRUE or FALSE */
 
   /* The easy case, where our internal casing operations align with those of
   the callout. */
@@ -492,7 +492,7 @@ switch (state->to_case)
   rest_to_case = PCRE2_SUBSTITUTE_CASE_NONE;
   break;
 
-  case PCRE2_SUBSTITUTE_CASE_REVERSE_TITLE_FIRST: // Can only be single_char FALSE
+  case PCRE2_SUBSTITUTE_CASE_REVERSE_TITLE_FIRST: /* Can only be single_char FALSE */
   ch1_to_case = PCRE2_SUBSTITUTE_CASE_LOWER;
   rest_to_case = PCRE2_SUBSTITUTE_CASE_UPPER;
   break;
diff --git a/deps/pcre2/pcre2_util.h b/deps/pcre2/pcre2_util.h
index 7bfbee099..667b1e7c9 100644
--- a/deps/pcre2/pcre2_util.h
+++ b/deps/pcre2/pcre2_util.h
@@ -141,7 +141,7 @@ and also specially-formatted comments.
 
 This macro should be used with no following semicolon, and ideally with a comment: */
 
-//  PCRE2_FALLTHROUGH /* Fall through */
+/*  PCRE2_FALLTHROUGH */  /* Fall through */
 
 #ifndef PCRE2_FALLTHROUGH