diff -u -r ../php-7.2.3/ext/opcache/config.m4 ./ext/opcache/config.m4
--- ../php-7.2.3/ext/opcache/config.m4	2018-02-27 16:33:06.000000000 +0000
+++ ./ext/opcache/config.m4	2018-03-10 23:38:51.259947633 +0000
@@ -147,7 +147,9 @@
 }
 ],dnl
     AC_DEFINE(HAVE_SHM_MMAP_ANON, 1, [Define if you have mmap(MAP_ANON) SHM support])
-    msg=yes,msg=no,msg=no)
+    msg=yes,msg=no,
+    AC_DEFINE(HAVE_SHM_MMAP_ANON, 1, [Define if you have mmap(MAP_ANON) SHM support])
+    msg=yes)
   AC_MSG_RESULT([$msg])
 
   AC_MSG_CHECKING(for mmap() using /dev/zero shared memory support)
@@ -358,7 +360,15 @@
 	flock_type=linux
     AC_DEFINE([HAVE_FLOCK_LINUX], [], [Struct flock is Linux-type])
     AC_MSG_RESULT("yes")
-], AC_MSG_RESULT("no") )
+], [
+    AC_MSG_RESULT("no")
+], [
+    dnl cross-compiling; assume Linux
+    flock_type=linux
+    AC_DEFINE([HAVE_FLOCK_LINUX], [], [Struct flock is Linux-type])
+    AC_MSG_RESULT("yes")
+])
+
 
 AC_MSG_CHECKING("whether flock struct is BSD ordered")
 AC_TRY_RUN([
@@ -374,7 +384,13 @@
 	flock_type=bsd
     AC_DEFINE([HAVE_FLOCK_BSD], [], [Struct flock is BSD-type]) 
     AC_MSG_RESULT("yes")
-], AC_MSG_RESULT("no") )
+], [
+    AC_MSG_RESULT("no")
+], [
+    dnl cross-compiling; assume Linux
+    AC_MSG_RESULT("no")
+])
+
 
 if test "$flock_type" = "unknown"; then
 	AC_MSG_ERROR([Don't know how to define struct flock on this system[,] set --enable-opcache=no])
@@ -417,6 +433,9 @@
 	Optimizer/zend_dump.c,
 	shared,,-DZEND_ENABLE_STATIC_TSRMLS_CACHE=1,,yes)
 
+  OPCACHE_SHARED_LIBADD=-lpcre
+  PHP_SUBST(OPCACHE_SHARED_LIBADD)
+
   PHP_ADD_BUILD_DIR([$ext_builddir/Optimizer], 1)
   PHP_ADD_EXTENSION_DEP(opcache, pcre)
 fi