For systems with pci you will want libpci, but for systems that do not have pci you will not.
libpci has been made an optional lib, but for thoes who have pci, a warning has been added.
this warning is to let people know that PowerTOP was configured with pci support.
diff --git a/configure.ac b/configure.ac
index cb14cf3..e9d0ae7 100644
--- a/configure.ac
+++ b/configure.ac
@@ -47,9 +47,10 @@
 
 AC_SEARCH_LIBS([delwin], [ncursesw ncurses], [], AC_MSG_ERROR([ncurses is required but was not found]), [])
 
-PKG_CHECK_MODULES([PCIUTILS], [libpci],[],[
-	AC_SEARCH_LIBS([pci_get_dev], [pci],[], AC_DEFINE([HAVE_NO_PCI],[1],[Define if pci is not supported]), [])
-]) 
+has_libpci=0
+PKG_CHECK_MODULES([PCIUTILS], [libpci],[has_libpci=1],[
+	AC_SEARCH_LIBS([pci_get_dev], [pci],[has_libpci=1], [has_libpci=0] )])
+ 
 
 has_libnl_ver=0
 PKG_CHECK_MODULES([LIBNL], [libnl-1], [has_libnl_ver=1], [
@@ -65,6 +66,16 @@
 	AC_DEFINE([HAVE_LIBNL20], [1], [Define if you have libnl-2.0 or higher])
 fi
 
+if (test "$has_libpci" -eq 0); then 
+	AC_DEFINE([HAVE_NO_PCI],[1],[Define if pci is not supported])
+        AC_MSG_WARN([
+			************* LIBPCI SUPPORT NOT CONFIGURED**************
+			If you need or want pci support, please install libpci 
+			and re-configure PowerTOP. 
+			*********************************************************
+	])
+fi
+
 AC_SEARCH_LIBS([pthread_create], [pthread], [], AC_MSG_ERROR([libpthread is required but was not found]), [])
 AC_SEARCH_LIBS([inet_aton], [resolv], [], AC_MSG_ERROR([libresolv is required but was not found]), [])