AC_DEFUN([IMAP_INC_CHK],[if test -r "$i$1/c-client.h"; then
    AC_DEFINE(HAVE_IMAP2000, 1, [ ])
    IMAP_DIR=$i
    IMAP_INC_DIR=$i$1
    break
  elif test -r "$i$1/rfc822.h"; then
    IMAP_DIR=$i;
    IMAP_INC_DIR=$i$1
    break
])

AC_DEFUN([IMAP_LIB_CHK],[
  str="$IMAP_DIR/$1/lib$lib.*"
  for i in `echo $str`; do
    test -r $i && IMAP_LIBDIR=$IMAP_DIR/$1 && break 2
  done
])

dnl PHP_IMAP_TEST_BUILD(function, action-if-ok, action-if-not-ok, extra-libs, extra-source)
dnl
dnl The UW-IMAP c-client library was not originally designed to be a
dnl shared library. The mm_foo functions are callbacks, and are required
dnl to be implemented by the program that is linking to c-client. This
dnl macro does the work of defining them all to no-ops for you. Note
dnl that PHP_TEST_BUILD is a link test; the undefined symbols will only
dnl cause problems if you actually try to link with c-client. For
dnl example, if your test is trivial enough to be optimized out, and if
dnl you link with --as-needed, the test/library may be omitted entirely
dnl from the final executable. In that case linking will of course
dnl succeed, but your luck won't necessarily apply at lower optimization
dnl levels or systems where --as-needed is not used.
AC_DEFUN([PHP_IMAP_TEST_BUILD], [
  PHP_TEST_BUILD([$1], [$2], [$3], [$4], [$5]
  [
#if defined(__GNUC__) && __GNUC__ >= 4
# define PHP_IMAP_EXPORT __attribute__ ((visibility("default")))
#else
# define PHP_IMAP_EXPORT
#endif

    PHP_IMAP_EXPORT void mm_log(void){}
    PHP_IMAP_EXPORT void mm_dlog(void){}
    PHP_IMAP_EXPORT void mm_flags(void){}
    PHP_IMAP_EXPORT void mm_fatal(void){}
    PHP_IMAP_EXPORT void mm_critical(void){}
    PHP_IMAP_EXPORT void mm_nocritical(void){}
    PHP_IMAP_EXPORT void mm_notify(void){}
    PHP_IMAP_EXPORT void mm_login(void){}
    PHP_IMAP_EXPORT void mm_diskerror(void){}
    PHP_IMAP_EXPORT void mm_status(void){}
    PHP_IMAP_EXPORT void mm_lsub(void){}
    PHP_IMAP_EXPORT void mm_list(void){}
    PHP_IMAP_EXPORT void mm_exists(void){}
    PHP_IMAP_EXPORT void mm_searched(void){}
    PHP_IMAP_EXPORT void mm_expunged(void){}
  ])
])

AC_DEFUN([PHP_IMAP_KRB_CHK], [
  if test "$PHP_KERBEROS" != "no"; then
    PKG_CHECK_MODULES([KERBEROS], [krb5-gssapi krb5])

    PHP_EVAL_INCLINE($KERBEROS_CFLAGS)
    PHP_EVAL_LIBLINE($KERBEROS_LIBS, IMAP_SHARED_LIBADD)

    AC_DEFINE(HAVE_IMAP_KRB, 1, [Whether IMAP extension has Kerberos support])
  else
    AC_EGREP_HEADER(auth_gss, $IMAP_INC_DIR/linkage.h, [
      AC_MSG_ERROR([This c-client library is built with Kerberos support.

      Add --with-kerberos to your configure line. Check config.log for details.
      ])
    ])
  fi
])

AC_DEFUN([PHP_IMAP_SSL_CHK], [
  if test "$PHP_IMAP_SSL" != "no"; then
    if test "$PHP_OPENSSL" = ""; then
      PHP_OPENSSL='no'
    fi
    PHP_SETUP_OPENSSL(IMAP_SHARED_LIBADD,
    [
      AC_DEFINE(HAVE_IMAP_SSL,1,[ ])
    ], [
      AC_MSG_ERROR([OpenSSL libraries not found.

      Check whether openssl is on your PKG_CONFIG_PATH and the output in config.log)
      ])
    ])
  elif test -f "$IMAP_INC_DIR/linkage.c"; then
    AC_EGREP_HEADER(ssl_onceonlyinit, $IMAP_INC_DIR/linkage.c, [
      AC_MSG_ERROR([This c-client library is built with SSL support.

      Add --with-imap-ssl to your configure line. Check config.log for details.
      ])
    ])
  fi
])

PHP_ARG_WITH([imap],
  [for IMAP support],
  [AS_HELP_STRING([[--with-imap[=DIR]]],
    [Include IMAP support. DIR is the c-client install prefix])])

PHP_ARG_WITH([kerberos],
  [for IMAP Kerberos support],
  [AS_HELP_STRING([--with-kerberos],
    [IMAP: Include Kerberos support])],
  [no],
  [no])

PHP_ARG_WITH([imap-ssl],
  [for IMAP SSL support],
  [AS_HELP_STRING([[--with-imap-ssl]],
    [IMAP: Include SSL support])],
  [no],
  [no])

if test "$PHP_IMAP" != "no"; then
    PHP_SUBST(IMAP_SHARED_LIBADD)
    PHP_NEW_EXTENSION(imap, php_imap.c, $ext_shared,, -DZEND_ENABLE_STATIC_TSRMLS_CACHE=1)
    AC_DEFINE(HAVE_IMAP,1,[ ])

    for i in $PHP_IMAP /usr/local /usr; do
      IMAP_INC_CHK()
      el[]IMAP_INC_CHK(/include/c-client)
      el[]IMAP_INC_CHK(/include/imap)
      el[]IMAP_INC_CHK(/include)
      el[]IMAP_INC_CHK(/imap)
      el[]IMAP_INC_CHK(/c-client)
      fi
    done

    dnl Check for c-client version 2004
    AC_EGREP_HEADER(mail_fetch_overview_sequence, $IMAP_INC_DIR/mail.h, [
      AC_DEFINE(HAVE_IMAP2004,1,[ ])
    ])

    dnl Check for new version of the utf8_mime2text() function
    old_CFLAGS=$CFLAGS
    CFLAGS="-I$IMAP_INC_DIR"
    AC_CACHE_CHECK(for utf8_mime2text signature, ac_cv_utf8_mime2text,
      AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#include <stdio.h>
#include <c-client.h>
      ]],[[
        SIZEDTEXT *src, *dst;
        utf8_mime2text(src, dst);
      ]])],[
        ac_cv_utf8_mime2text=old
      ],[
        ac_cv_utf8_mime2text=new
      ])
    )
    if test "$ac_cv_utf8_mime2text" = "new"; then
      AC_DEFINE(HAVE_NEW_MIME2TEXT, 1, [Whether utf8_mime2text() has new signature])
    fi
    CFLAGS=$old_CFLAGS

    old_CFLAGS=$CFLAGS
    CFLAGS="-I$IMAP_INC_DIR"
    AC_CACHE_CHECK(for U8T_DECOMPOSE, ac_cv_u8t_decompose,
      AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#include <c-client.h>
      ]],[[
         int i = U8T_CANONICAL;
      ]])],[
         ac_cv_u8t_decompose=yes
      ],[
         ac_cv_u8t_decompose=no
      ])
    )
    CFLAGS=$old_CFLAGS

    if test "$ac_cv_u8t_decompose" = "no" && test "$ac_cv_utf8_mime2text" = "new"; then
		AC_MSG_ERROR([utf8_mime2text() has new signature, but U8T_CANONICAL is missing. This should not happen. Check config.log for additional information.])
    fi
    if test "$ac_cv_u8t_decompose" = "yes" && test "$ac_cv_utf8_mime2text" = "old"; then
		AC_MSG_ERROR([utf8_mime2text() has old signature, but U8T_CANONICAL is present. This should not happen. Check config.log for additional information.])
    fi

    dnl Check for c-client version 2001
    old_CPPFLAGS=$CPPFLAGS
    CPPFLAGS=-I$IMAP_INC_DIR
    AC_EGREP_CPP(this_is_true, [
#include "imap4r1.h"
#if defined(IMAPSSLPORT)
      this_is_true
#endif
    ],[
      AC_DEFINE(HAVE_IMAP2001, 1, [ ])
    ],[])
    CPPFLAGS=$old_CPPFLAGS

    PHP_CHECK_LIBRARY(pam, pam_start,
    [
      PHP_ADD_LIBRARY(pam,, IMAP_SHARED_LIBADD)
      AC_DEFINE(HAVE_LIBPAM,1,[ ])
    ])

    PHP_CHECK_LIBRARY(crypt, crypt,
    [
      PHP_ADD_LIBRARY(crypt,, IMAP_SHARED_LIBADD)
      AC_DEFINE(HAVE_LIBCRYPT,1,[ ])
    ])

    PHP_EXPAND_PATH($IMAP_DIR, IMAP_DIR)

    if test -z "$IMAP_DIR"; then
      AC_MSG_ERROR(Cannot find rfc822.h. Please check your c-client installation.)
    fi

    if test ! -r "$IMAP_DIR/c-client/libc-client.a" && test -r "$IMAP_DIR/c-client/c-client.a" ; then
      ln -s "$IMAP_DIR/c-client/c-client.a" "$IMAP_DIR/c-client/libc-client.a" >/dev/null 2>&1
    elif test ! -r "$IMAP_DIR/$PHP_LIBDIR/libc-client.a" && test -r "$IMAP_DIR/$PHP_LIBDIR/c-client.a"; then
      ln -s "$IMAP_DIR/$PHP_LIBDIR/c-client.a" "$IMAP_DIR/$PHP_LIBDIR/libc-client.a" >/dev/null 2>&1
    fi

    for lib in c-client4 c-client imap; do
      IMAP_LIB=$lib
      IMAP_LIB_CHK($PHP_LIBDIR)
      IMAP_LIB_CHK(c-client)
    done

    if test -z "$IMAP_LIBDIR"; then
      AC_MSG_ERROR(Cannot find imap library (libc-client.a). Please check your c-client installation.)
    fi

    PHP_ADD_INCLUDE($IMAP_INC_DIR)
    PHP_ADD_LIBRARY_DEFER($IMAP_LIB,, IMAP_SHARED_LIBADD)
    PHP_ADD_LIBPATH($IMAP_LIBDIR, IMAP_SHARED_LIBADD)
    PHP_IMAP_KRB_CHK
    PHP_IMAP_SSL_CHK

    dnl Test the build in the end
    TST_LIBS="$DLIBS $IMAP_SHARED_LIBADD"

    dnl Check if auth_gss exists
    PHP_IMAP_TEST_BUILD(auth_gssapi_valid, [
      AC_DEFINE(HAVE_IMAP_AUTH_GSS, 1, [ ])
    ], [], $TST_LIBS)

    dnl Check if utf8_to_mutf7 exists.
    old_CPPFLAGS="${CPPFLAGS}"
    CPPFLAGS="${CPPFLAGS} -I${IMAP_INC_DIR}"
    AC_LANG_PUSH(C)
    AC_CACHE_CHECK(for utf8_to_mutf7, ac_cv_utf8_to_mutf7,
      AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <c-client.h>]],[[
        unsigned char c = '\0';
        utf8_to_mutf7(&c);
      ]])],[
        AC_DEFINE(HAVE_IMAP_MUTF7, 1, [ ])
        ac_cv_utf8_to_mutf7=yes
      ],[
        ac_cv_utf8_to_mutf7=no
      ])
    )
    AC_LANG_POP


    AC_MSG_CHECKING(whether rfc822_output_address_list function present)
    PHP_TEST_BUILD(foobar, [
      AC_MSG_RESULT(yes)
      AC_DEFINE(HAVE_RFC822_OUTPUT_ADDRESS_LIST, 1, [ ])
    ], [
      AC_MSG_RESULT(no)
	], [
      $TST_LIBS
    ], [
#if defined(__GNUC__) && __GNUC__ >= 4
# define PHP_IMAP_EXPORT __attribute__ ((visibility("default")))
#else
# define PHP_IMAP_EXPORT
#endif

      PHP_IMAP_EXPORT void mm_log(void){}
      PHP_IMAP_EXPORT void mm_dlog(void){}
      PHP_IMAP_EXPORT void mm_flags(void){}
      PHP_IMAP_EXPORT void mm_fatal(void){}
      PHP_IMAP_EXPORT void mm_critical(void){}
      PHP_IMAP_EXPORT void mm_nocritical(void){}
      PHP_IMAP_EXPORT void mm_notify(void){}
      PHP_IMAP_EXPORT void mm_login(void){}
      PHP_IMAP_EXPORT void mm_diskerror(void){}
      PHP_IMAP_EXPORT void mm_status(void){}
      PHP_IMAP_EXPORT void mm_lsub(void){}
      PHP_IMAP_EXPORT void mm_list(void){}
      PHP_IMAP_EXPORT void mm_exists(void){}
      PHP_IMAP_EXPORT void mm_searched(void){}
      PHP_IMAP_EXPORT void mm_expunged(void){}
      void rfc822_output_address_list(void);
      void (*f)(void);
      char foobar () {f = rfc822_output_address_list;}
    ])

    AC_MSG_CHECKING(whether build with IMAP works)
    PHP_IMAP_TEST_BUILD(mail_newbody, [
      AC_MSG_RESULT(yes)
    ], [
      AC_MSG_RESULT(no)
      AC_MSG_ERROR([build test failed. Please check the config.log for details.])
    ], $TST_LIBS)
fi