build: When no gpg-error-config, not install gpgme-config.

* configure.ac (USE_GPGRT_CONFIG): New.
* src/Makefile.am [USE_GPGRT_CONFIG]: Conditionalize the install
of gpgme-config.

--

When system will migrate use of gpgrt-config and removal of
gpg-error-config, gpgme-config will not be installed (but use gpgme.pc
by gpgrt-config).

Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>

configure.ac

@@ -724,6 +724,9 @@ AM_PATH_GPG_ERROR("$NEED_GPG_ERROR_VERSION",
 AC_DEFINE(GPG_ERR_SOURCE_DEFAULT, GPG_ERR_SOURCE_GPGME,
           [The default error source for GPGME.])
 
+AM_CONDITIONAL(USE_GPGRT_CONFIG, [test -n "$GPGRT_CONFIG" \
+                                  -a "$ac_cv_path_GPG_ERROR_CONFIG" = no])
+
 # And for libassuan.
 have_libassuan=no
 AM_PATH_LIBASSUAN("$NEED_LIBASSUAN_API:$NEED_LIBASSUAN_VERSION",

src/Makefile.am

@@ -26,7 +26,11 @@ EXTRA_DIST = gpgme-config.in gpgme.m4 libgpgme.vers ChangeLog-2011 \
 	     gpgme.h.in versioninfo.rc.in gpgme.def \
 	     gpgme.pc.in gpgme-glib.pc.in
 
+if USE_GPGRT_CONFIG
+noinst_SCRIPTS = gpgme-config
+else
 bin_SCRIPTS = gpgme-config
+endif
 m4datadir = $(datadir)/aclocal
 m4data_DATA = gpgme.m4
 nodist_include_HEADERS = gpgme.h