diff --git a/libical.spec b/libical.spec
index 308cb4b..d844a02 100644
--- a/libical.spec
+++ b/libical.spec
@@ -1,7 +1,7 @@
 Summary:	Reference implementation of the iCalendar data type and serialization format
 Name:		libical
 Version:	3.0.3
-Release:	2%{?dist}
+Release:	3%{?dist}
 License:	LGPLv2 or MPLv2.0
 URL:		https://libical.github.io/libical/
 Source:		https://github.com/%{name}/%{name}/archive/v%{version}/%{name}-%{version}.tar.gz
@@ -10,6 +10,7 @@ BuildRequires:	gcc
 BuildRequires:	gcc-c++
 BuildRequires:	cmake
 BuildRequires:	gtk-doc
+BuildRequires:	pkgconfig
 BuildRequires:	pkgconfig(gobject-2.0)
 BuildRequires:	pkgconfig(gobject-introspection-1.0)
 BuildRequires:	pkgconfig(libxml-2.0)
@@ -29,8 +30,6 @@ used in dozens of calendaring and scheduling products.
 %package devel
 Summary:	Development files for libical
 Requires:	%{name}%{?_isa} = %{version}-%{release}
-Requires:	pkgconfig(icu-i18n)
-Requires:	pkgconfig(icu-uc)
 
 %description devel
 The libical-devel package contains libraries and header files for developing
@@ -38,8 +37,6 @@ applications that use libical.
 
 %package glib
 Summary:	GObject wrapper for libical library
-Provides:	libical-glib%{?_isa} = %{version}-%{release}
-Obsoletes:	libical-glib < 3.0.0
 Requires:	%{name}%{?_isa} = %{version}-%{release}
 
 %description glib
@@ -48,9 +45,6 @@ of GObject Introspection.
 
 %package glib-doc
 Summary:	Documentation files for %{name}-glib
-Group:		Development/Libraries
-Provides:	libical-glib-doc = %{version}-%{release}
-Obsoletes:	libical-glib-doc < 3.0.0
 BuildArch:	noarch
 
 %description glib-doc
@@ -58,12 +52,8 @@ This package contains developer documentation for %{name}-glib.
 
 %package glib-devel
 Summary:	Development files for building against %{name}-glib
-Group:		Development/Libraries
-Provides:	libical-glib-devel%{?_isa} = %{version}-%{release}
-Obsoletes:	libical-glib-devel < 3.0.0
-Requires:	%{name}%{?_isa} = %{version}-%{release}
-Requires:	pkgconfig(glib-2.0)
-Requires:	pkgconfig(gobject-2.0)
+Requires:	%{name}-devel%{?_isa} = %{version}-%{release}
+Requires:	%{name}-glib%{?_isa} = %{version}-%{release}
 
 %description glib-devel
 Development files needed for building things which link against %{name}-glib.
@@ -83,7 +73,8 @@ pushd %{_target_platform}
   -DSHARED_ONLY:BOOL=true
 popd
 
-make %{?_smp_mflags} -C %{_target_platform} -j1
+# avoid parallel-builds, gir generatation fails on slower archs
+%make_build -j1 -C %{_target_platform}
 
 %install
 make install/fast DESTDIR=%{buildroot} -C %{_target_platform}
@@ -94,7 +85,8 @@ make test ARGS="-V" -C %{_target_platform}
 %ldconfig_scriptlets
 
 %files
-%doc LICENSE ReadMe.txt THANKS
+%doc ReadMe.txt THANKS
+%license LICENSE
 %{_libdir}/libical.so.3*
 %{_libdir}/libical_cxx.so.3*
 %{_libdir}/libicalss.so.3*
@@ -114,6 +106,8 @@ make test ARGS="-V" -C %{_target_platform}
 %{_libdir}/cmake/LibIcal/
 %{_includedir}/libical/
 
+%ldconfig_scriptlets glib
+
 %files glib
 %{_libdir}/libical-glib.so.3*
 %{_libdir}/girepository-1.0/ICalGLib-3.0.typelib
@@ -129,6 +123,15 @@ make test ARGS="-V" -C %{_target_platform}
 %{_datadir}/gtk-doc/html/%{name}-glib
 
 %changelog
+* Sat Apr 28 2018 Rex Dieter <rdieter@fedoraproject.org> - 3.0.3-3
+- use %%license
+- %%build: use %%make_build
+- -glib: add %%ldconfig_scriptlets
+- -glib: no need to Obsoletes/Provides itself
+- -glib-devel: Requires -devel,-glib (instead of base pkg)
+- drop deprecated Group: tag
+- -devel: drop hardcoded pkgconfig deps (let rpm autodetection do it)
+
 * Mon Mar 12 2018 Christian Stadelmann <fedora@genodeftest.de> - 3.0.3-2
 - Update upstream URL