[sysprof] build: fix distcheck arguments

[Christian Hergert <chergert src gnome org>]

commit 2be47dc0e47da99ed7ad8639c8bbc4a417e5a3d7
Author: Christian Hergert <chergert redhat com>
Date:   Sun Mar 19 22:35:44 2017 -0700

    build: fix distcheck arguments
    
    We need to delay expansion of ${prefix} until the next configuration
    done by distcheck.

 Makefile.am |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index 8ef9e81..78f6f3b 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -10,7 +10,7 @@ EXTRA_DIST = \
        config.h.meson \
        po/meson.build
 
-DISTCHECK_CONFIGURE_FLAGS = --with-sysprofd=bundled 
--with-systemdsystemunitdir='$(prefix)/etc/systemd/system'
+DISTCHECK_CONFIGURE_FLAGS = --enable-gtk --with-sysprofd=bundled 
--with-systemdsystemunitdir='\${prefix}/etc/systemd/system'
 
 AUTHORS:
        $(AM_V_GEN)if test -d "$(srcdir)/.git"; \