diff --git a/gnome-shell-extension-sustmi.spec b/gnome-shell-extension-sustmi.spec
index 67730b3..0e5ee18 100644
--- a/gnome-shell-extension-sustmi.spec
+++ b/gnome-shell-extension-sustmi.spec
@@ -15,12 +15,6 @@ BuildArch:  noarch
 # Eventually, I'd like to split these into fully separate packages, but they're committed together in the same GitHub repo, and I don't see a way to check release versions of the individual extensions on the "EGO" website. Maybe sustmi will be willing to start tagging releases or something.
 Source0: https://github.com/sustmi/gnome-shell-extensions-sustmi/archive/%{commit}.tar.gz
 
-Requires: gnome-shell >= 3.8
-
-# CentOS 7 build environment doesn't support Recommends tag.
-%if 0%{?fedora}
-Recommends: gnome-tweak-tool
-%endif
 
 
 %description
@@ -29,8 +23,19 @@ and historymanager-prefix-search
 
 
 
-%package  windowoverlay-icons
-Summary:  Show app icons on top of the windows thumbnails in Activities Overview
+%package   windowoverlay-icons
+Summary:   Show app icons on top of the windows thumbnails in Activities Overview
+Requires:  gnome-shell >= 3.8
+
+# (CentOS 7 build environment doesn't support Recommends tag.)
+%if 0%{?fedora}
+Recommends: gnome-tweak-tool
+%endif
+
+# CentOS 7 doesn't automatically do gschema compilation yet.
+%if 0%{?rhel}
+BuildRequires: glib2
+%endif
 
 %description  windowoverlay-icons
 Sometimes when you have many open windows, especially if they all
@@ -54,8 +59,20 @@ You may also need to restart GNOME Shell (open the command dialog with
 Alt-F2, type `r`, and hit enter), or log out and log back in.
 
 
-%package  historymanager-prefix-search
-Summary:  Use PageUp and PageDown to search for previous GNOME Shell commands
+
+%package   historymanager-prefix-search
+Summary:   Use PageUp and PageDown to search for previous GNOME Shell commands
+Requires:  gnome-shell >= 3.8
+
+# (CentOS 7 build environment doesn't support Recommends tag.)
+%if 0%{?fedora}
+Recommends: gnome-tweak-tool
+%endif
+
+# CentOS 7 doesn't automatically do gschema compilation yet.
+%if 0%{?rhel}
+BuildRequires: glib2
+%endif
 
 %description  historymanager-prefix-search
 The GNOME Shell Run Command dialog (Alt-F2) and Looking Glass let you
@@ -81,6 +98,7 @@ You may also need to restart GNOME Shell (open the command dialog with
 Alt-F2, type `r`, and hit enter), or log out and log back in.
 
 
+
 %prep
 %autosetup -n gnome-shell-extensions-sustmi-%{commit}