clients: Make poppler-glib optional
Just don't compile the view client.
diff --git a/configure.ac b/configure.ac
index 5568218..31654a6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -25,7 +25,10 @@
PKG_CHECK_MODULES(COMPOSITOR,
[egl glesv2 gdk-pixbuf-2.0 libudev >= 136 libdrm >= 2.4.17] xcb-dri2 xcb-xfixes)
PKG_CHECK_MODULES(CLIENT, [egl gl cairo gdk-pixbuf-2.0 glib-2.0 gobject-2.0 xkbcommon libdrm])
-PKG_CHECK_MODULES(POPPLER, [poppler-glib gdk-2.0])
+PKG_CHECK_MODULES(POPPLER, [poppler-glib gdk-2.0],
+ [have_poppler=yes], [have_poppler=no])
+AM_CONDITIONAL(HAVE_POPPLER, test "x$have_poppler" = "xyes")
+
PKG_CHECK_MODULES(CAIRO_GL, [cairo-gl],
[have_cairo_gl=yes], [have_cairo_gl=no])
AS_IF([test "x$have_cairo_gl" = "xyes"],