Use pkgconfig for BuildRequires

Additionally, drop some obsolete BuildRequires.

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

baobab.spec

@@ -10,10 +10,7 @@ License:        GPLv2+ and GFDL
 URL:            https://live.gnome.org/Baobab
 Source0:        https://download.gnome.org/sources/baobab/3.15/%{name}-%{version}.tar.xz
 
-BuildRequires:  chrpath
-BuildRequires:  gobject-introspection-devel
-BuildRequires:  gtk3-devel >= %{gtk3_version}
-BuildRequires:  libgtop2-devel
+BuildRequires:  pkgconfig(gtk+-3.0) >= %{gtk3_version}
 BuildRequires:  intltool
 BuildRequires:  desktop-file-utils
 BuildRequires:  itstool
@@ -43,8 +40,6 @@ make %{?_smp_mflags}
 %install
 make install DESTDIR=$RPM_BUILD_ROOT
 
-chrpath --delete $RPM_BUILD_ROOT%{_bindir}/baobab
-
 %find_lang %{name} --with-gnome
 
 
@@ -91,6 +86,7 @@ done
 * Wed Feb 18 2015 David King <amigadave@amigadave.com> - 3.15.90-1
 - Update to 3.15.90
 - Use license macro for COPYING and COPYING.docs
+- Use pkgconfig for BuildRequires
 
 * Tue Oct 14 2014 Kalev Lember <kalevlember@gmail.com> - 3.14.1-1
 - Update to 3.14.1