Use pkgconfig for BuildRequires

https://fedoraproject.org/wiki/Packaging:PkgConfigBuildRequires

gnome-keyring.spec

@@ -1,8 +1,7 @@
-%define glib2_version 2.38.0
-%define gcr_version 3.5.3
-%define dbus_version 1.1.1
-%define gcrypt_version 1.2.2
-%define libtasn1_version 0.3.4
+%global glib2_version 2.38.0
+%global gcr_version 3.5.3
+%global dbus_version 1.1.1
+%global gcrypt_version 1.2.2
 
 Summary: Framework for managing passwords and other secrets
 Name: gnome-keyring
@@ -14,21 +13,19 @@ Group: System Environment/Libraries
 Source:  https://download.gnome.org/sources/%{name}/3.15/%{name}-%{version}.tar.xz
 URL:     https://wiki.gnome.org/Projects/GnomeKeyring
 
-BuildRequires: glib2-devel >= %{glib2_version}
-BuildRequires: gcr-devel >= %{gcr_version}
-BuildRequires: dbus-devel >= %{dbus_version}
-BuildRequires: libgcrypt-devel >= %{gcrypt_version}
-BuildRequires: libtasn1-devel >= %{libtasn1_version}
-BuildRequires: pam-devel
-BuildRequires: autoconf, automake, libtool
+BuildRequires: pkgconfig(dbus-1) >= %{dbus_version}
+BuildRequires: pkgconfig(gcr-3) >= %{gcr_version}
+BuildRequires: pkgconfig(glib-2.0) >= %{glib2_version}
+BuildRequires: pkgconfig(p11-kit-1)
+BuildRequires: docbook-dtds
+BuildRequires: docbook-style-xsl
 BuildRequires: gettext
 BuildRequires: intltool
-BuildRequires: libtasn1-tools
-BuildRequires: gtk-doc
 BuildRequires: libcap-ng-devel
+BuildRequires: libgcrypt-devel >= %{gcrypt_version}
 BuildRequires: libselinux-devel
-BuildRequires: p11-kit-devel
-BuildRequires: gcr-devel
+BuildRequires: pam-devel
+BuildRequires: /usr/bin/xsltproc
 
 # we no longer have a devel subpackage
 Obsoletes: %{name}-devel < 3.3.0
@@ -112,6 +109,7 @@ glib-compile-schemas %{_datadir}/glib-2.0/schemas >&/dev/null || :
 * Thu Feb 26 2015 David King <amigadave@amigadave.com> - 3.15.90-1
 - Update to 3.15.90
 - Update URL
+- Use pkgconfig for BuildRequires
 
 * Sat Feb 21 2015 Till Maas <opensource@till.name> - 3.14.0-2
 - Rebuilt for Fedora 23 Change