Add PCRE Headers test in config.m4

config.m4

@@ -1,6 +1,16 @@
 PHP_ARG_ENABLE(AOP, whether to enable AOP support,
 [ --enable-AOP   Enable AOP support])
 
+    AC_MSG_CHECKING([for PCRE headers location])
+    for i in  /usr/include /usr/include/pcre /usr/local/include; do
+      test -f $i/pcre.h && PCRE_INCDIR=$i
+    done
+
+    if test -z "$PCRE_INCDIR"; then
+      AC_MSG_ERROR([Could not find pcre.h in $PHP_PCRE_REGEX])
+    fi
+    AC_MSG_RESULT([$PCRE_INCDIR])
+
 if test "$PHP_AOP" = "yes"; then
   AC_DEFINE(HAVE_AOP, 1, [aop])
   PHP_NEW_EXTENSION(aop, aop.c Lexer.c aop_joinpoint.c, $ext_shared)