diff --git a/gnu/packages/gimp.scm b/gnu/packages/gimp.scm
index 9db543199c..399c99bcdf 100644
--- a/gnu/packages/gimp.scm
+++ b/gnu/packages/gimp.scm
@@ -101,6 +101,7 @@ provided as well as the framework to add new color models and data types.")
        ("libjpeg" ,libjpeg-8)))
     (native-inputs
      `(("pkg-config" ,pkg-config)
+       ("glib" ,glib "bin")             ; for gtester
        ("intltool" ,intltool)))
     (home-page "http://gegl.org")
     (synopsis "Graph based image processing framework")
diff --git a/gnu/packages/mail.scm b/gnu/packages/mail.scm
index d9c847d4ce..7bdd81b4c8 100644
--- a/gnu/packages/mail.scm
+++ b/gnu/packages/mail.scm
@@ -301,6 +301,7 @@ repository and Maildir/IMAP as LOCAL repository.")
     (build-system gnu-build-system)
     (native-inputs
      `(("pkg-config" ,pkg-config)
+       ("glib" ,glib "bin")             ; for gtester
        ("texinfo" ,texinfo)))
     ;; TODO: Add webkit and gtk to build the mug GUI.
     (inputs