Use pkgconfig for BuildRequires

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

pango.spec

@@ -17,15 +17,15 @@ Group: System Environment/Libraries
 Source: http://download.gnome.org/sources/%{name}/1.37/%{name}-%{version}.tar.xz
 URL: http://www.pango.org
 
-BuildRequires: glib2-devel >= %{glib2_version}
 BuildRequires: pkgconfig >= %{pkgconfig_version}
-BuildRequires: freetype-devel >= %{freetype_version}
-BuildRequires: fontconfig-devel >= %{fontconfig_version}
-BuildRequires: libXft-devel
-BuildRequires: cairo-devel >= %{cairo_version}
-BuildRequires: libthai-devel >= %{libthai_version}
-BuildRequires: harfbuzz-devel >= %{harfbuzz_version}
-BuildRequires: gobject-introspection-devel
+BuildRequires: pkgconfig(cairo) >= %{cairo_version}
+BuildRequires: pkgconfig(freetype2) >= %{freetype_version}
+BuildRequires: pkgconfig(glib-2.0) >= %{glib2_version}
+BuildRequires: pkgconfig(fontconfig) >= %{fontconfig_version}
+BuildRequires: pkgconfig(harfbuzz) >= %{harfbuzz_version}
+BuildRequires: pkgconfig(libthai) >= %{libthai_version}
+BuildRequires: pkgconfig(xft) >= %{libXft_version}
+BuildRequires: pkgconfig(gobject-introspection-1.0)
 BuildRequires: cairo-gobject-devel
 # Bootstrap requirements
 BuildRequires: gnome-common intltool gtk-doc
@@ -142,6 +142,7 @@ fi
 %changelog
 * Tue Jun 23 2015 David King <amigadave@amigadave.com> - 1.37.1-1
 - Update to 1.37.1
+- Use pkgconfig for BuildRequires
 
 * Thu Jun 18 2015 Fedora Release Engineering <rel-eng@lists.fedoraproject.org> - 1.37.0-2
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_23_Mass_Rebuild