diff --git a/kjs/regexp.cpp b/kjs/regexp.cpp
index c92a69d6a..04159904f 100644
--- a/kjs/regexp.cpp
+++ b/kjs/regexp.cpp
@@ -30,17 +30,21 @@
 
 using namespace KJS;
 
+#ifdef HAVE_PCRE2POSIX
 RegExp::UTF8SupportState RegExp::utf8Support = RegExp::Unknown;
+#endif
 
 RegExp::RegExp(const UString &p, int f)
   : pat(p), flgs(f), m_notEmpty(false), valid(true), buffer(0), originalPos(0)
 {
+#ifdef HAVE_PCRE2POSIX
   // Determine whether libpcre has unicode support if need be..
   if (utf8Support == Unknown) {
     uint32_t supported;
     pcre2_config(PCRE2_CONFIG_COMPILED_WIDTHS, (void*)&supported);
     utf8Support = (supported & 0x0001) ? Supported : Unsupported;
   }
+#endif
 
   nrSubPatterns = 0; // determined in match() with POSIX regex.
 
@@ -276,9 +280,11 @@ void RegExp::prepareMatch(const UString &s)
 {
   delete[] originalPos; // Just to be sure..
   delete[] buffer;
+#ifdef HAVE_PCRE2POSIX
   if (utf8Support == Supported)
     prepareUtf8(s);
   else
+#endif
     prepareASCII(s);
 
 #ifndef NDEBUG
diff --git a/kjs/regexp.h b/kjs/regexp.h
index e731eb714..d84fca17c 100644
--- a/kjs/regexp.h
+++ b/kjs/regexp.h
@@ -21,6 +21,7 @@
 #ifndef _KJS_REGEXP_H_
 #define _KJS_REGEXP_H_
 
+#include <stdint.h>
 #include <sys/types.h>
 
 #include "config.h"