Thanks to plugins, library itself doesn't require plugged libraries.
--- ethumb-0.1.1.65643/configure.ac.orig	2011-11-05 12:22:10.000000000 +0100
+++ ethumb-0.1.1.65643/configure.ac	2011-12-14 19:30:27.011501774 +0100
@@ -140,10 +140,6 @@
 
 AC_ETH_OPTIONAL_MODULE([emotion], true, [CHECK_MODULE_EMOTION])
 
-if $USE_MODULE_EMOTION ; then
-        requirement_ethumb="$requirement_ethumb emotion"
-fi
-
 AM_CONDITIONAL(HAVE_EPDF, false)
 define([CHECK_MODULE_EPDF],
 [
@@ -151,9 +147,6 @@
 ])
 
 AC_ETH_OPTIONAL_MODULE([epdf], true, [CHECK_MODULE_EPDF])
-if $USE_MODULE_EPDF ; then
-        requirement_ethumb="$requirement_ethumb epdf"
-fi
 
 AM_CONDITIONAL(HAVE_EDBUS, false)
 define([CHECK_MODULE_ETHUMBD],