Convert to pkg-config support to match changes done to 
the gpg-error recipe for gpg-error.pc  generation.

Upstream-Status: Inappropriate [OE specific]

Signed-off-by: Armin Kuster <akuster@mvista.com>

Index: pinentry-1.0.0/m4/gpg-error.m4
===================================================================
--- pinentry-1.0.0.orig/m4/gpg-error.m4
+++ pinentry-1.0.0/m4/gpg-error.m4
@@ -25,74 +25,12 @@ dnl config script does not match the hos
 dnl is added to the gpg_config_script_warn variable.
 dnl
 AC_DEFUN([AM_PATH_GPG_ERROR],
-[ AC_REQUIRE([AC_CANONICAL_HOST])
-  gpg_error_config_prefix=""
-  dnl --with-libgpg-error-prefix=PFX is the preferred name for this option,
-  dnl since that is consistent with how our three siblings use the directory/
-  dnl package name in --with-$dir_name-prefix=PFX.
-  AC_ARG_WITH(libgpg-error-prefix,
-              AC_HELP_STRING([--with-libgpg-error-prefix=PFX],
-                             [prefix where GPG Error is installed (optional)]),
-              [gpg_error_config_prefix="$withval"])
-
-  dnl Accept --with-gpg-error-prefix and make it work the same as
-  dnl --with-libgpg-error-prefix above, for backwards compatibility,
-  dnl but do not document this old, inconsistently-named option.
-  AC_ARG_WITH(gpg-error-prefix,,
-              [gpg_error_config_prefix="$withval"])
-
-  if test x"${GPG_ERROR_CONFIG}" = x ; then
-     if test x"${gpg_error_config_prefix}" != x ; then
-        GPG_ERROR_CONFIG="${gpg_error_config_prefix}/bin/gpg-error-config"
-     else
-       case "${SYSROOT}" in
-         /*)
-           if test -x "${SYSROOT}/bin/gpg-error-config" ; then
-             GPG_ERROR_CONFIG="${SYSROOT}/bin/gpg-error-config"
-           fi
-           ;;
-         '')
-           ;;
-          *)
-           AC_MSG_WARN([Ignoring \$SYSROOT as it is not an absolute path.])
-           ;;
-       esac
-     fi
-  fi
-
-  AC_PATH_PROG(GPG_ERROR_CONFIG, gpg-error-config, no)
+[
   min_gpg_error_version=ifelse([$1], ,0.0,$1)
-  AC_MSG_CHECKING(for GPG Error - version >= $min_gpg_error_version)
-  ok=no
-  if test "$GPG_ERROR_CONFIG" != "no" \
-     && test -f "$GPG_ERROR_CONFIG" ; then
-    req_major=`echo $min_gpg_error_version | \
-               sed 's/\([[0-9]]*\)\.\([[0-9]]*\)/\1/'`
-    req_minor=`echo $min_gpg_error_version | \
-               sed 's/\([[0-9]]*\)\.\([[0-9]]*\)/\2/'`
-    gpg_error_config_version=`$GPG_ERROR_CONFIG $gpg_error_config_args --version`
-    major=`echo $gpg_error_config_version | \
-               sed 's/\([[0-9]]*\)\.\([[0-9]]*\).*/\1/'`
-    minor=`echo $gpg_error_config_version | \
-               sed 's/\([[0-9]]*\)\.\([[0-9]]*\).*/\2/'`
-    if test "$major" -gt "$req_major"; then
-        ok=yes
-    else
-        if test "$major" -eq "$req_major"; then
-            if test "$minor" -ge "$req_minor"; then
-               ok=yes
-            fi
-        fi
-    fi
-  fi
+  PKG_CHECK_MODULES(GPG_ERROR, [gpg-error >= $min_gpg_error_version gpg-error], [ok=yes], [ok=no])
   if test $ok = yes; then
-    GPG_ERROR_CFLAGS=`$GPG_ERROR_CONFIG $gpg_error_config_args --cflags`
-    GPG_ERROR_LIBS=`$GPG_ERROR_CONFIG $gpg_error_config_args --libs`
-    GPG_ERROR_MT_CFLAGS=`$GPG_ERROR_CONFIG $gpg_error_config_args --mt --cflags 2>/dev/null`
-    GPG_ERROR_MT_LIBS=`$GPG_ERROR_CONFIG $gpg_error_config_args --mt --libs 2>/dev/null`
-    AC_MSG_RESULT([yes ($gpg_error_config_version)])
     ifelse([$2], , :, [$2])
-    gpg_error_config_host=`$GPG_ERROR_CONFIG $gpg_error_config_args --host 2>/dev/null || echo none`
+    gpg_error_config_host=`$PKG_CONFIG --host gpg-error 2>/dev/null || echo none`
     if test x"$gpg_error_config_host" != xnone ; then
       if test x"$gpg_error_config_host" != x"$host" ; then
   AC_MSG_WARN([[
@@ -107,10 +45,6 @@ AC_DEFUN([AM_PATH_GPG_ERROR],
       fi
     fi
   else
-    GPG_ERROR_CFLAGS=""
-    GPG_ERROR_LIBS=""
-    GPG_ERROR_MT_CFLAGS=""
-    GPG_ERROR_MT_LIBS=""
     AC_MSG_RESULT(no)
     ifelse([$3], , :, [$3])
   fi